of 10 ( 2 Earth's Movement 147182 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What causes the different seasons on Earth? Choice Feedback A. Increasing levels of carbon dioxide in the atmosphere. Carbon dioxide in the atmosphere increases the temperature, but it does not change the seasons. B. The speed at which the Earth rotates on its axis The speed of Earth's rotation is the same everywhere, but the northern hemisphere experiences winter when the southern hemisphere experiences summer. C. The distance between Earth and the sun Earth is closest to the sun on January 4. *D. The angles at which the suns rays strike the Earth That's correct! Global Incorrect Feedback The correct answer is: The angles at which the sun's rays strike the Earth. Because the Earth is tilted on its axis, the sun's rays strike the Earth at different angles throughout the year, causing seasons. -------------------------------------------------------------------------------- Question 1b of 10 ( 2 Earth's Movement 249343 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which of the following is the cause for the different seasons on Earth? Choice Feedback A. Changing levels of gas compositions throughout the year This does not determine the seasons. B. The direction Earth spins around its axis The direction it spins does not determine the seasons. C. The distance from Earth to the sun Earth is closest to the sun on January 4. *D. The way Earth has a tilted axis That's correct! Global Incorrect Feedback The correct answer is: The way Earth has a tilted axis. Because the Earth is tilted on its axis, the sun's rays strike the Earth at different angles throughout the year, causing seasons. -------------------------------------------------------------------------------- Question 1c of 10 ( 2 Earth's Movement 249344 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What causes the different seasons on Earth? Choice Feedback A. The fact that Earth goes along an ecliptic The ecliptic merely describes the plane that Earth orbits in. B. The fact that Earth rotates around its axis The rotation of Earth around its axis is responsible for the days and nights, not the seasons. C. The way that Earth gets closer and farther from the sun throughout the year Earth is closest to the sun on January 4. *D. The way heat energy reflects off of Earth because of the angle at which it hits That's correct! Global Incorrect Feedback The correct answer is: The way heat energy reflects off of Earth due to the angle at which it hits. Because the Earth is tilted on its axis, the sun's rays strike the Earth at different angles throughout the year, causing seasons. -------------------------------------------------------------------------------- Question 2a of 10 ( 2 Earth's Movement 147759 ) Maximum Attempts: 1 Question Type: True-False Maximum Score: 5 Question: Earth is closest to the sun during the month of January. Choice Feedback *A. True That's correct! B. False Because Earth is tilted on its axis, the suns rays strike Earth at an angle. Global Incorrect Feedback The correct answer is: True. Earth is closest to the sun during the month of January. -------------------------------------------------------------------------------- Question 2b of 10 ( 2 Earth's Movement 249345 ) Maximum Attempts: 1 Question Type: True-False Maximum Score: 5 Question: Earth is closest to the sun during the month of August. Choice Feedback A. True When half of Earth is in summer, the other half is in winter. *B. False That's correct! Global Incorrect Feedback The correct answer is: False. Earth is closest to the sun during the month of January. -------------------------------------------------------------------------------- Question 2c of 10 ( 2 Earth's Movement 249346 ) Maximum Attempts: 1 Question Type: True-False Maximum Score: 5 Question: The Northern Hemisphere experiences winter when Earth is farthest from the sun. Choice Feedback A. True Because Earth is tilted on its axis, the sun's rays strike Earth at an angle, causing the seasons. Earth is closest to the sun during winter, but the Northern Hemisphere is tilted away from the sun during this time, causing winter. *B. False That's correct! Global Incorrect Feedback The correct answer is: False. Earth is closest to the sun during the month of January. -------------------------------------------------------------------------------- Question 3a of 10 ( 3 Comparing Planets 338104 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each moon or planet to the most accurate characteristic. Choice Text Correct Match Match Text A. Earth's moon D. It contains large amounts of frozen water. B. Venus C. Astronomers believe there is a good chance it contains liquid water. C. Europa A. It doesn't have enough gravity to have an atmosphere. D. Mars B. The temperature of its atmosphere is increased by high levels of carbon dioxide. Attempt Incorrect Feedback 1st That's not a correct match. In general, large planets and moons have thicker atmospheres. Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: The moon is small and doesn't have enough gravity to have an atmosphere. The temperature of the atmosphere around Venus is increased by high levels of carbon dioxide. Astronomers believe there is a good chance Jupiter's moon Europa contains liquid water. Mars contains large amounts of frozen water at its poles. -------------------------------------------------------------------------------- Question 3b of 10 ( 3 Comparing Planets 338105 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each moon or planet to the most accurate characteristic. Choice Text Correct Match Match Text A. Earth's moon D. Scientists believe it used to have flowing liquid water. B. Venus C. It is too cold for liquid water to exist on the surface. C. Europa A. It has no atmosphere due to weak gravity. D. Mars B. It is too hot for liquid water to exist. Attempt Incorrect Feedback 1st That's not a correct match. In general, large planets and moons have thicker atmospheres. Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: The moon is small and doesn't have enough gravity to have an atmosphere. The temperature of the atmosphere around Venus is too high for liquid water to exist. Europa is coated in a thick layer of ice. Mars contains large amounts of frozen water at its poles, and may have had flowing liquid water at some point. -------------------------------------------------------------------------------- Question 3c of 10 ( 3 Comparing Planets 338106 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each moon or planet to the most accurate characteristic. Choice Text Correct Match Match Text A. Mercury D. It used to be more like Earth. B. Venus C. There may be liquid water under a thick layer of ice. C. Europa A. It doesn't have enough gravity to have an atmosphere. D. Mars B. The temperature of its atmosphere is increased by the greenhouse effect. Attempt Incorrect Feedback 1st That's not a correct match. In general, large planets and moons have thicker atmospheres. Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: Mercury is small and doesn't have enough gravity to have an atmosphere. The temperature of the atmosphere around Venus is increased by high levels of carbon dioxide, which causes the greenhouse effect. Astronomers believe there is a good chance Jupiter's moon Europa contains liquid water under a thick layer of ice. Mars used to be more similar to Earth. -------------------------------------------------------------------------------- Question 4a of 10 ( 2 Comparing Planets 147185 ) Maximum Attempts: 1 Question Type: Ordering Maximum Score: 5 Question: Arrange the planets in order of increasing strength of their magnetic fields. Correct Answer: 1. Venus 2. Earth 3. Jupiter Attempt Incorrect Feedback 1st That's not the correct order. Spacecrafts can not land on Jupiter because astronomers lose contact with them. Correct Feedback That's the correct order. Global Incorrect Feedback The correct order is: Venus, Earth, Jupiter. -------------------------------------------------------------------------------- Question 4b of 10 ( 2 Comparing Planets 249349 ) Maximum Attempts: 1 Question Type: Ordering Maximum Score: 5 Question: Arrange the planets from strongest magnetic field to weakest magnetic field. Correct Answer: 1. Jupiter 2. Earth 3. Venus Attempt Incorrect Feedback 1st That's not the correct order. Spacecrafts can not land on Jupiter because astronomers lose contact with them. Correct Feedback That's the correct order. Global Incorrect Feedback The correct order is: Jupiter, Earth, Venus. -------------------------------------------------------------------------------- Question 4c of 10 ( 2 Comparing Planets 249350 ) Maximum Attempts: 1 Question Type: Ordering Maximum Score: 5 Question: Arrange the planets in order based on how strongly their magnetic fields deflect charged particles, from weakest to strongest. Correct Answer: 1. Venus 2. Earth 3. Jupiter Attempt Incorrect Feedback 1st That's not the correct order. Spacecrafts can not land on Jupiter because astronomers lose contact with them. Correct Feedback That's the correct order. Global Incorrect Feedback The correct order is: Venus, Earth, Jupiter. -------------------------------------------------------------------------------- Question 5a of 10 ( 3 Habitability of Planets 338107 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each property with the benefit it provides to people on Earth. Choice Text Correct Match Match Text A. magnetic field D. moderates changes in temperature on the surface B. ozone C. retains heat energy from the sun in the atmosphere C. carbon dioxide A. prevents charged particles from the sun from reaching the surface D. water in oceans, lakes, rivers and streams B. filters cancer-causing rays from the sun Attempt Incorrect Feedback 1st That's not a correct match. The different layers of the atmosphere perform different functions. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: The magnetic field prevents charged particles from the sun from reaching the surface. Ozone filters cancer-causing rays from the sun. Carbon dioxide retains heat energy from the sun in the atmosphere. Water moderates changes in temperature on the surface. -------------------------------------------------------------------------------- Question 5b of 10 ( 3 Habitability of Planets 338108 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each property with the benefit it provides to people on Earth. Choice Text Correct Match Match Text A. magnetic field D. moderates changes in temperature on the surface B. ozone C. retains heat energy from the sun in the atmosphere C. carbon dioxide A. prevents charged particles from the sun from reaching the surface D. water in oceans, lakes, rivers and streams B. filters cancer-causing rays from the sun Attempt Incorrect Feedback 1st That's not a correct match. The different layers of the atmosphere perform different functions. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: The magnetic field prevents charged particles from the sun from reaching the surface. Ozone filters cancer-causing rays from the sun. Carbon dioxide retains heat energy from the sun in the atmosphere. Water moderates changes in temperature on the surface. -------------------------------------------------------------------------------- Question 5c of 10 ( 3 Habitability of Planets 338109 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each property with the benefit it provides to people on Earth. Choice Text Correct Match Match Text A. magnetic field D. keeps the temperature of the surface from changing rapidly B. ozone C. elevates the temperature of the planet C. carbon dioxide A. deflects charged particles from the sun D. water in oceans, lakes, rivers and streams B. filters ultraviolet rays from the sun Attempt Incorrect Feedback 1st That's not a correct match. The different layers of the atmosphere perform different functions. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: The magnetic field prevents charged particles from the sun from reaching the surface by deflecting them. Ozone filters cancer-causing ultraviolet rays from the sun. Carbon dioxide retains heat energy from the sun in the atmosphere, elevating the temperature. Water moderates changes in temperature on the surface, preventing rapid changes. -------------------------------------------------------------------------------- Question 6a of 10 ( 2 Habitability of Planets 147187 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: oxygen, o, o2 Question: Plants take in carbon dioxide and release _____ gas. Attempt Incorrect Feedback 1st That's not correct! Consider how elements are recycled. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: oxygen. Plants take in carbon dioxide and release oxygen gas. -------------------------------------------------------------------------------- Question 6b of 10 ( 2 Habitability of Planets 249353 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: carbon dioxide, co2 Question: Plants take in _______ and release oxygen gas. Attempt Incorrect Feedback 1st That's not correct! Consider how elements are recycled. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: carbon dioxide. Plants take in carbon dioxide and release oxygen gas. -------------------------------------------------------------------------------- Question 6c of 10 ( 2 Habitability of Planets 249354 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: carbon dioxide, co2 Question: Humans breathe in oxygen and release _____ gas. Attempt Incorrect Feedback 1st That's not correct! Consider how elements are recycled. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: carbon dioxide. Humans breathe in oxygen and release carbon dioxide gas. -------------------------------------------------------------------------------- Question 7a of 10 ( 3 The Moon 147188 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why is one side of the moon called "the dark side of the moon"? Choice Feedback A. The moon is in Earth's shadow. The moon is sometimes between Earth and the sun. *B. The moon both rotates on its axis and revolves around Earth every 28 days. That's correct! C. Earth is in the moon's shadow. The moon is not always between Earth and the sun. Global Incorrect Feedback The correct answer is: The moon both rotates on its axis and revolves around Earth every 28 days. The same side of the moon is always facing Earth. -------------------------------------------------------------------------------- Question 7b of 10 ( 3 The Moon 249355 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why is one side of the moon called "the dark side of the moon"? Choice Feedback A. The moon's rotation time is exactly half the time of its revolution. This is not true. *B. The moon's rotation and revolution take the same time. That's correct! C. The moon's rotation time is exactly twice the time of its revolution. This is not true. Global Incorrect Feedback The correct answer is: The moon's rotation and revolution take the same time. The same side of the moon is always facing Earth. -------------------------------------------------------------------------------- Question 7c of 10 ( 3 The Moon 249356 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why is one side of the moon called "the dark side of the moon"? Choice Feedback A. Half of the moon emits light, while the other half does not. The moon does not emit light. *B. The amount of time it takes to rotate around its axis is the same amount of time it takes to revolve around Earth. That's correct! C. Only half of the moon is in Earth's shadow at any given time. Earth's shadow does not cause this. Global Incorrect Feedback The correct answer is: The amount of time it takes to rotate around its axis is the same amount of time it takes to revolve around Earth. The same side of the moon is always facing Earth. -------------------------------------------------------------------------------- Question 8a of 10 ( 2 Habitability of Planets 147189 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why is there so little evidence of the Period of Heavy Bombardment on Earth? Choice Feedback A. The moon's gravity prevented asteroids from reaching Earth. The moon is smaller and has less gravity than Earth. *B. Weathering, plate movements and volcanoes destroyed many of the craters. That's correct! C. Earth's magnetic field prevented asteroids from striking Earth. The magnetic field prevents charged particles from the sun from reaching Earth. D. Asteroids burn up in Earth's thick atmosphere. Small asteroids burn up in Earth's thick atmosphere. Global Incorrect Feedback The correct answer is: Weathering, plate movements and volcanoes destroyed many of the craters. Weathering, plate movements and volcanoes destroyed many of the craters created on earth during the Period of Heavy Bombardment. -------------------------------------------------------------------------------- Question 8b of 10 ( 2 Habitability of Planets 249357 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which contributes to the lack of evidence of the Period of Heavy Bombardment on Earth? Choice Feedback A. The moon's gravity The moon does not affect this. *B. Earth's volcanoes That's correct! C. Earth's magnetic field The magnetic field prevents charged particles from the sun from reaching Earth. D. Earth's atmosphere Small asteroids burn up in Earth's thick atmosphere. Global Incorrect Feedback The correct answer is: Earth's volcanoes. Weathering, plate movements and volcanoes destroyed many of the craters created on earth during the Period of Heavy Bombardment. -------------------------------------------------------------------------------- Question 8c of 10 ( 2 Habitability of Planets 249358 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which contributes to the lack of evidence of the Period of Heavy Bombardment on Earth? Choice Feedback A. choice text This would not have a large effect. *B. Plate movements That's correct! C. The supply of oxygen Oxygen would not erase evidence of this period. D. Earth's vegetation Vegetation would have little effect. Global Incorrect Feedback The correct answer is: Plate movements. Weathering, plate movements and volcanoes destroyed many of the craters created on earth during the Period of Heavy Bombardment. -------------------------------------------------------------------------------- Question 9a of 10 ( 2 The Moon 147193 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: lunar cycle, cycle Question: The side of the moon that faces the sun is always illuminated, but that side does not always face Earth. The different phases of the moon are caused by the moon's near 28-day _____. Attempt Incorrect Feedback 1st That's not quite right. The moon waxes and wanes in a repeating pattern. Correct Feedback That's correct. Global Incorrect Feedback The correct answer is: lunar cycle. The different phases of the moon are caused by the moon's 28-day lunar cycle. -------------------------------------------------------------------------------- Question 9b of 10 ( 2 The Moon 249359 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: 28 Question: The moon's lunar cycle is close to ______ days long. Attempt Incorrect Feedback 1st That's not quite right. The moon waxes and wanes in a repeating pattern. Correct Feedback That's correct. Global Incorrect Feedback The correct answer is: 28. The different phases of the moon are caused by the moon's 27.3-day lunar cycle. -------------------------------------------------------------------------------- Question 9c of 10 ( 2 The Moon 249360 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: 28 days Question: The cause of the phases of the moon is a cycle that is close to _______ long. Attempt Incorrect Feedback 1st That's not quite right. The moon waxes and wanes in a repeating pattern. Correct Feedback That's correct. Global Incorrect Feedback The correct answer is: 28 days. The different phases of the moon are caused by the moon's 28-day lunar cycle. -------------------------------------------------------------------------------- Question 10a of 10 ( 2 The Moon 147191 ) Maximum Attempts: 1 Question Type: Numeric Fill In Blank Maximum Score: 5 Correct Answer: 4 Question: The moon's gravity causes how many tides every 24 hours? Attempt Incorrect Feedback 1st That's not correct. Sometimes the tide is high, and sometimes the tide is low. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: 4. The moon's gravity pulls on the part of Earth closest to it more than it pulls on the part of Earth farthest from it. This causes 4 tides every day -- 2 high tides and 2 low tides. -------------------------------------------------------------------------------- Question 10b of 10 ( 2 The Moon 249361 ) Maximum Attempts: 1 Question Type: Numeric Fill In Blank Maximum Score: 5 Correct Answer: 2 Question: How many high tides happen at a given coast in any 24 hour period? Attempt Incorrect Feedback 1st That's not correct. Sometimes the tide is high, and sometimes the tide is low. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: 2. The moon's gravity pulls on the part of Earth closest to it more than it pulls on the part of Earth farthest from it. This causes 4 tides every day - 2 high tides and 2 low tides. -------------------------------------------------------------------------------- Question 10c of 10 ( 2 The Moon 249362 ) Maximum Attempts: 1 Question Type: Numeric Fill In Blank Maximum Score: 5 Correct Answer: 2 Question: How many low tides happen at a given coast in any 24-hour period? Attempt Incorrect Feedback 1st That's not correct. Sometimes the tide is high, and sometimes the tide is low. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: 2. The moon's gravity pulls on the part of Earth closest to it more than it pulls on the part of Earth farthest from it. This causes 4 tides every day -- 2 high tides and 2 low tides. --------------------------------------------------------------------------------