estion 1a of 10 ( 1 Solar Processes 147144 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: fusion Question: At 15.6 million degrees Celcius, the temperature of the sun's core is high enough for nuclear _____ to occur. Attempt Incorrect Feedback 1st Hydrogen atoms combine to form helium atoms in the sun's core. Correct Feedback That's correct. Global Incorrect Feedback The correct answer is: fusion. Nuclear fusion occurs in the sun's core. -------------------------------------------------------------------------------- Question 1b of 10 ( 1 Solar Processes 250314 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: fusion Question: It takes an extremely high temperature for nuclear _____ to occur inside the sun. Attempt Incorrect Feedback 1st Hydrogen atoms combine to form helium atoms in the sun's core. Correct Feedback That's correct. Global Incorrect Feedback The correct answer is: fusion. Nuclear fusion occurs in the sun's core. -------------------------------------------------------------------------------- Question 1c of 10 ( 1 Solar Processes 250315 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: fusion, nuclear fusion Question: The sun produces energy from matter in its core through the process of _______. Attempt Incorrect Feedback 1st Hydrogen atoms combine to form helium atoms in the sun's core. Correct Feedback That's correct. Global Incorrect Feedback The correct answer is: nuclear fusion. Nuclear fusion occurs in the sun's core. -------------------------------------------------------------------------------- Question 2a of 10 ( 2 The Structure of the Sun 147145 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Visible light comes from which one of the sun's layers? Choice Feedback A. The core Gamma ray photons are created in the core. B. The radiative zone Energy is transferred between particles through radiation in the radiative zone. C. The convection zone Energy is transferred between atoms through convection in the convection zone. *D. The photosphere That's correct! E. The corona The corona is too hot to see. Global Incorrect Feedback The correct answer is: The photosphere. Visible light comes from the photosphere. -------------------------------------------------------------------------------- Question 2b of 10 ( 2 The Structure of the Sun 250316 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: In which layer of the sun is energy transferred between atoms? Choice Feedback A. The core Gamma ray photons are created in the core. B. The radiative zone Energy is transferred between particles through radiation in the radiative zone. C. The photosphere Light is released from the photosphere. *D. The convection zone That's correct! E. The corona Energy is not transferred here. Global Incorrect Feedback The correct answer is: The convection zone. Energy is transferred between atoms through convection in the convection zone. -------------------------------------------------------------------------------- Question 2c of 10 ( 2 The Structure of the Sun 250317 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: In which layer of the sun are gamma ray photons produced? Choice Feedback A. The photosphere Visible light comes from the photosphere. B. The radiative zone Energy is transferred between particles through radiation in the radiative zone. C. The convection zone Energy is transferred between atoms through convection in the convection zone. *D. The core That's correct! E. The corona The corona does not produce gamma ray photons. Global Incorrect Feedback The correct answer is: The core. Gamma ray photons are created in the core. -------------------------------------------------------------------------------- Question 3a of 10 ( 2 The Structure of the Sun 147146 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: corona Question: Solar flares may be seen in the sun's _____. Attempt Incorrect Feedback 1st Solar flares are explosions that occur near sunspots. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: corona. Solar flares may be seen in the sun's corona. -------------------------------------------------------------------------------- Question 3b of 10 ( 2 The Structure of the Sun 250318 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: Photosphere Question: Sunspots are temporary disturbances in the sun's _____. Attempt Incorrect Feedback 1st Sunspots may be somehow related to prominences and solar flares. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: photosphere. Sunspots appear on the photosphere. -------------------------------------------------------------------------------- Question 3c of 10 ( 2 The Structure of the Sun 250319 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: Corona Question: Prominences may be seen in the sun's _____. Attempt Incorrect Feedback 1st Prominences are large arcs of gas extending from the sun. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: corona. Prominences may be seen in the sun's corona. -------------------------------------------------------------------------------- Question 4a of 10 ( 1 Solar Processes 338058 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each term to its definition. Choice Text Correct Match Match Text A. solar wind B. a violent explosion that may appear as a loop or an arc B. solar prominence A. a stream of charged protons and electrons C. gamma ray photon C. energy released during nuclear fusion Attempt Incorrect Feedback 1st That's not a correct match. Violent eruptions occur in the corona. Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: Solar wind is a stream of charged protons and electrons released from the corona. Solar prominences are violent explosions that may appear as loops or arcs in the corona. Gamma ray photons are released during nuclear fusion in the core. -------------------------------------------------------------------------------- Question 4b of 10 ( 1 Solar Processes 338059 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each term to its related description. Choice Text Correct Match Match Text A. solar flares B. every 11 years there is a peak in the number of them B. sunspots A. a big explosion on the surface of the sun C. solar wind C. gives comets their tail Attempt Incorrect Feedback 1st That's not a correct match. Violent eruptions occur in the corona. Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: Solar wind is a stream of charged protons and electrons released from the corona. Comets' tails always point away from this wind. Solar flares are big explosions on the surface of the sun. The number of sunspots peaks every 11 years. -------------------------------------------------------------------------------- Question 4c of 10 ( 1 Solar Processes 338060 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each term to its definition. Choice Text Correct Match Match Text A. solar wind B. includes prominences and solar flares B. coronal mass ejections A. a stream of plasma C. gamma ray photon C. energy released during nuclear fusion Attempt Incorrect Feedback 1st That's not a correct match. The solar wind comes from the corona. Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: Solar wind is a stream of charged protons and electrons, called a plasma, released from the corona. Coronal mass ejections include both prominences and solar flares. Gamma ray photons are released during nuclear fusion in the core. -------------------------------------------------------------------------------- Question 5a of 10 ( 2 Solar Processes 147148 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which best describes how the sun rotates? Choice Feedback A. The sun rotates once each year. Earth revolves around the sun once each year. B. The sun does not rotate. Objects rotate on their axes and revolve around other objects. C. The sun rotates every 11 years. 11 years is the length of a sunspot cycle. Because the sun is not solid, it does not rotate in the same way Earth rotates. *D. The sun rotates more slowly at its poles. That's correct! Global Incorrect Feedback The correct answer is: The sun rotates more slowly at its poles. The sun rotates every 27 days at its diameter. It rotates every 33 days at its poles. -------------------------------------------------------------------------------- Question 5b of 10 ( 2 Solar Processes 250322 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: How do we know the sun rotates? Choice Feedback A. Both sides are red-shifted. This is not true. B. Both sides are blue-shifted. This is not true. C. Because Earth rotates. That wouldn't mean that the sun would necessarily rotate. *D. One side is blue-shifted and the other side is red-shifted. That's correct! Global Incorrect Feedback The correct answer is: One side is blue-shifted and the other side is red-shifted. One side is blue-shifted and the other side is red-shifted, meaning that one side is coming toward us and the other side is moving away from us. -------------------------------------------------------------------------------- Question 5c of 10 ( 2 Solar Processes 250323 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: The sun rotates _______. Choice Feedback A. once per year. Earth revolves around the sun once each year. B. around Earth once per year. Earth revolves around the sun once per year. C. every 31 days. Because the sun is not solid, it does not rotate in the same way Earth rotates. *D. at different speeds along its sphere. That's correct! Global Incorrect Feedback The correct answer is: at different speeds along its sphere. The sun rotates every 27 days at its diameter. It rotates every 33 days at its poles. -------------------------------------------------------------------------------- Question 6a of 10 ( 1 The Terrestrial Planets 147149 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why are Mercury, Venus, Earth and Mars called the "terrestrial" planets? Choice Feedback A. They all have solid cores. Earth and Venus have liquid cores. *B. They are all made of rock. That's correct. C. They all have liquid cores and rocky surfaces. Mars and Mercury have solid cores. D. They have all been able to support some form of life. Evidence of liquid water on Mars raises the possibility that there may have been life there at some point. Global Incorrect Feedback The correct answer is: They are all made of rock. -------------------------------------------------------------------------------- Question 6b of 10 ( 1 The Terrestrial Planets 250324 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What do all of the terrestrial planets have in common? Choice Feedback A. They all have solid cores. Earth and Venus have liquid cores. *B. They all have rocky surfaces. That's correct. C. They all have liquid cores. Mars and Mercury have solid cores. D. They all have liquid water. Mercury and Venus do not have liquid water, and Mars may not either. Global Incorrect Feedback The correct answer is: They all have rocky surfaces. -------------------------------------------------------------------------------- Question 6c of 10 ( 1 The Terrestrial Planets 250325 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which of the following do all the terrestrial planets have in common? Choice Feedback A. They all have moderate temperatures. Only Earth has moderate temperatures. *B. They all have a solid, rocky surface. That's correct. C. They all have liquid cores. Mars and Mercury have solid cores. D. They can all support human life. Venus and Mercury would almost certainly not support human life. Global Incorrect Feedback The correct answer is: They all have a solid, rocky surface. -------------------------------------------------------------------------------- Question 7a of 10 ( 1 The Terrestrial Planets 147150 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which lists the terrestrial planets in order from smallest to largest? Choice Feedback A. Mercury, Venus, Earth, Mars Mars is about one-half the size of Earth. B. Mercury, Venus, Mars, Earth Venus and Earth are almost the same size! *C. Mercury, Mars, Venus, Earth That's correct! D. Mercury, Mars, Earth, Venus Earth is the largest of the terrestrial planets. Global Incorrect Feedback The correct order is: Mercury, Mars, Venus, Earth. -------------------------------------------------------------------------------- Question 7b of 10 ( 1 The Terrestrial Planets 250326 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which is the smallest of the terrestrial planets? Choice Feedback A. Mars Mars is not the smallest. B. Venus Venus is not the smallest. *C. Mercury That's correct! D. Earth Earth is the largest of the terrestrial planets. Global Incorrect Feedback Mercury is the smallest of the terrestrial planets. -------------------------------------------------------------------------------- Question 7c of 10 ( 1 The Terrestrial Planets 250327 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which terrestrial planet is the largest? Choice Feedback A. Mars Mars is not the largest. B. Venus Venus is not the largest. *C. Earth That's correct! D. Mercury Mercury is the smallest. Global Incorrect Feedback Earth is the largest of the terrestrial planets. -------------------------------------------------------------------------------- Question 8a of 10 ( 2 The Terrestrial Planets 147151 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which planet experiences the widest range of temperatures? Choice Feedback *A. Mercury That's correct! B. Venus The atmosphere on Venus contains a lot of carbon dioxide, which keeps temperatures relatively high. C. Earth Water and carbon dioxide regulate Earth's temperature and make Earth hospitable to life. D. Mars The atmosphere on Mars contains carbon dioxide, which helps regulate temperature. Global Incorrect Feedback The correct answer is: Mercury. Mercury is too small to have an atmosphere, so it is extremely hot during the days and extremely cold during the nights. -------------------------------------------------------------------------------- Question 8b of 10 ( 2 The Terrestrial Planets 250328 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which planet experiences the smallest range of temperatures? Choice Feedback *A. Earth That's correct! B. Venus The atmosphere on Venus contains a lot of carbon dioxide, which keeps temperatures relatively high. C. Mercury Mercury is too small to have an atmosphere, so it is extremely hot during the days and extremely cold during the nights. D. Mars The atmosphere on Mars contains carbon dioxide, which helps regulate temperature. Global Incorrect Feedback The correct answer is: Earth. Water and carbon dioxide regulate Earth's temperature and make Earth hospitable to life. -------------------------------------------------------------------------------- Question 8c of 10 ( 2 The Terrestrial Planets 250329 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which planet has high temperatures due to the runaway greenhouse effect? Choice Feedback *A. Venus The atmosphere on Venus contains a lot of carbon dioxide, which keeps temperatures relatively high due to the runaway greenhouse effect. B. Earth Water and carbon dioxide regulate Earth's temperature and make Earth hospitable to life. C. Mercury Mercury is too small to have an atmosphere, so it is extremely hot during the days and extremely cold during the nights. D. Mars The atmosphere on Mars contains carbon dioxide, which helps regulate temperature. Global Incorrect Feedback The correct answer is: Venus. -------------------------------------------------------------------------------- Question 9a of 10 ( 2 The Terrestrial Planets 147758 ) Maximum Attempts: 1 Question Type: True-False Maximum Score: 5 Question: Of all the rocky planets, Venus is the one humans are most likely to colonize. Choice Feedback A. True The incredibly hot temperatures, the enormous pressure, and the sulfuric acid atmosphere make Venus the planet that we are least likely to colonize. *B. False That's correct! Global Incorrect Feedback The correct answer is: False. Mars is the planet that we are most likely to colonize. -------------------------------------------------------------------------------- Question 9b of 10 ( 2 The Terrestrial Planets 250330 ) Maximum Attempts: 1 Question Type: True-False Maximum Score: 5 Question: Of all the rocky planets, Mars is the one humans are most likely to colonize. Choice Feedback *A. True That's correct! B. False Although Mars is a cold, barren desert, it is the most hospitable of all the terrestrial planets. Global Incorrect Feedback The correct answer is: False. Mars is the planet that we are most likely to colonize. Although Mars is a cold, barren desert, it is the most hospitable of all the terrestrial planets. -------------------------------------------------------------------------------- Question 9c of 10 ( 2 The Terrestrial Planets 250331 ) Maximum Attempts: 1 Question Type: True-False Maximum Score: 5 Question: Of all the rocky planets, Mercury is the one humans are most likely to colonize. Choice Feedback A. True Mercury has incredibly large swings in temperature, no atmosphere, and is very close to the sun, making it very difficult to colonize. *B. False That's correct! Global Incorrect Feedback The correct answer is: False. Mars is the planet that we are most likely to colonize. -------------------------------------------------------------------------------- Question 10a of 10 ( 2 The Terrestrial Planets 338061 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each planet to an accurate characteristic. Choice Text Correct Match Match Text A. Mercury D. It experiences large dust storms. B. Venus C. Its atmosphere is mostly nitrogen. C. Earth A. Its diameter is less than one-half the length of Earth's diameter. D. Mars B. Its atmosphere contains thick clouds of sulfuric gas. Attempt Incorrect Feedback 1st Correct Feedback Those are correct matches! Global Incorrect Feedback The correct order is: Mercury is less than one-half the size of Earth. Thick clouds of sulfuric gas fill the atmosphere of Venus. Most of the gas in the Earth's atmosphere is nitrogen. Large dust storms often cover the entire surface of Mars. -------------------------------------------------------------------------------- Question 10b of 10 ( 2 The Terrestrial Planets 338062 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each planet to an accurate characteristic. Choice Text Correct Match Match Text A. Mercury D. It has two moons. B. Venus C. It has an abundance of liquid water. C. Earth A. It has no atmosphere. D. Mars B. It barely spins around its axis. Attempt Incorrect Feedback 1st Correct Feedback Those are correct matches! Global Incorrect Feedback The matches are: Mercury has no atmosphere Venus barely spins around its axis. Earth has an abundance of liquid water. Mars has two moons. -------------------------------------------------------------------------------- Question 10c of 10 ( 2 The Terrestrial Planets 338063 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match each planet to an accurate characteristic. Choice Text Correct Match Match Text A. Mercury D. It experiences large dust storms. B. Venus C. Its atmosphere is about 20 percent oxygen. C. Earth A. It is closest to the sun. D. Mars B. It has an extremely high pressure at its surface. Attempt Incorrect Feedback 1st Correct Feedback Those are correct matches! Global Incorrect Feedback The correct matches are: Mercury is closest to the sun. Venus has a thick atmosphere, leading to a high pressure at the surface. About 20 percent% of Earth's atmosphere is oxygen. Large dust storms often cover the entire surface of Mars. --------------------------------------------------------------------------------