er? Question 1a of 10 ( 3 Earth's Water Supply 150287 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why are so many big cities located along the banks of a river? Choice Feedback *A. Rivers provide a transportation route. That's correct! B. Rivers provide a convenient place for industries to release wastes. That's incorrect. Although some industries do release waste into rivers, it's not good for the river or for the community that surrounds it. C. Rivers are nice to look at. Rivers can be nice to look at, but that's not the right answer. D. Rivers are a good place to swim. People can swim in some rivers, but that's not the right answer. Global Incorrect Feedback The correct answer is: Rivers provide a transportation route. -------------------------------------------------------------------------------- Question 1b of 10 ( 3 Earth's Water Supply 249501 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What about Earth allows it to maintain bodies of water? Choice Feedback A. Tides Tides do not hold the bodies of water on Earth. B. Comet crashes This is incorrect. Comet crashes may have brought water to Earth, but they didn't keep it here. C. Mountains Mountains do not affect the planet's ability to hold water. *D. Moderate temperature That's correct! Global Incorrect Feedback The correct answer is: Moderate temperature. -------------------------------------------------------------------------------- Question 1c of 10 ( 3 Earth's Water Supply 249511 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What about Earth allows it to maintain bodies of water? Choice Feedback A. Strong magnetic field Strong magnetic fields are helpful, but have little to do with bodies of water. B. Plate movements This is incorrect. Plate movements do not hold water. C. Lunar tides The tides do not hold bodies of water together. *D. Strong gravity That's correct! Global Incorrect Feedback The correct answer is: Strong gravity. -------------------------------------------------------------------------------- Question 2a of 10 ( 2 Water Cycle 249492 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What is the phase change from liquid to gas? Choice Feedback A. Condensation That's incorrect. This is the change from gas to liquid. B. Sublimation That's incorrect. This is the change from solid to liquid. C. Transpiration That's incorrect. This is a process that takes place in plants. *D. Evaporation That's correct! Global Incorrect Feedback The correct answer is: Evaporation. -------------------------------------------------------------------------------- Question 2b of 10 ( 2 Water Cycle 249502 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What is the phase change from solid to gas? Choice Feedback A. Condensation That's incorrect. This is the change from gas to liquid. B. Evaporation That's incorrect. This is the change from liquid to gas. C. Freezing That's incorrect. This is the change from liquid to solid. *D. Sublimation That's correct! Global Incorrect Feedback The correct answer is: Sublimation. -------------------------------------------------------------------------------- Question 2c of 10 ( 2 Water Cycle 249512 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What is the phase change from gas to liquid? Choice Feedback A. Evaporation That's incorrect. This is the change from liquid to gas. B. Sublimation That's incorrect. This is the change from solid to liquid. C. Transpiration That's incorrect. This is a process that takes place in plants. *D. Condensation That's correct! Global Incorrect Feedback The correct answer is: Condensation. -------------------------------------------------------------------------------- Question 3a of 10 ( 2 Earth's Water Supply 338543 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match the description to the form of water that is described. Choice Text Correct Match Match Text A. Least dense form of water B. Liquid water B. Most dense form of water A. Water vapor C. Bonds hold water molecules far apart from each other C. Ice Attempt Incorrect Feedback 1st That's not it. Here's a hint: The bonds holding a molecule of a solid together are stronger than the bonds holding together the molecules of a gas. Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: Water vapor is the least dense form of water. Liquid water is the densest form of water. Bonds hold water molecules far apart from each other in ice. -------------------------------------------------------------------------------- Question 3b of 10 ( 2 Earth's Water Supply 338544 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match the approximate percentage of the world's water to where it is stored. Choice Text Correct Match Match Text A. Salt water B. 2 percent B. Ice caps and glaciers A. 97 percent C. Fresh liquid water C. 1 percent Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: The oceans hold about 97 percent of Earth's water in the form of saltwater. Just under 2 percent is in ice caps and glaciers. Just over 1 percent is fresh water in rivers, lakes, ponds and under the ground. -------------------------------------------------------------------------------- Question 3c of 10 ( 2 Earth's Water Supply 338545 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match the approximate percentage of the world's water to where it is stored. Choice Text Correct Match Match Text A. Liquid, salt water B. 2 percent B. Frozen water A. 97 percent C. Liquid, fresh water C. 1 percent Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: Salt water makes up about 97 percent of Earth's water. Just under 2 percent is in ice caps and glaciers. Just over 1 percent is fresh water in rivers, lakes, ponds and under the ground. -------------------------------------------------------------------------------- Question 4a of 10 ( 2 Water Cycle 150558 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: When you breathe onto a cold window and water droplets appear, it is an example of _____. Choice Feedback *A. condensation That's correct! B. evaporation That's not it. Evaporation occurs when water changes into a gas. Your breath is already a gas. C. sublimation That's incorrect. Sublimation occurs when a gas changes to a solid or vice versa. Your breath is a gas, not a solid. D. freezing That's not right. Freezing doesn't affect water vapor. Global Incorrect Feedback The correct answer is: condensation. -------------------------------------------------------------------------------- Question 4b of 10 ( 2 Water Cycle 249504 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: When the amount of water in a glass slowly decreases, this is due to _____. Choice Feedback *A. evaporation That's correct! B. condensation That's not it. Condensation occurs when gas changes into a liquid. C. sublimation That's incorrect. Sublimation occurs when a gas changes to a solid or vice versa. Your breath is a gas, not a solid. D. freezing That's not right. Freezing doesn't affect water vapor. Global Incorrect Feedback The correct answer is: evaporation. -------------------------------------------------------------------------------- Question 4c of 10 ( 2 Water Cycle 249514 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: When water droplets appear on the outside of a cold glass of iced tea, this is an example of _____. Choice Feedback *A. condensation That's correct! B. evaporation That's not it. Evaporation occurs when water changes into a gas. Your breath is already a gas. C. sublimation That's incorrect. Sublimation occurs when a gas changes to a solid or vice versa. Your breath is a gas, not a solid. D. freezing That's not right. Freezing doesn't affect water vapor. Global Incorrect Feedback The correct answer is: condensation. -------------------------------------------------------------------------------- Question 5a of 10 ( 1 Properties of Water 153666 ) Maximum Attempts: 1 Question Type: Numeric Fill In Blank Maximum Score: 5 Correct Answer: 100 Question: What is the boiling point (in degrees Celsius) of water? Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: 100. Water boils at 100¡C. -------------------------------------------------------------------------------- Question 5b of 10 ( 1 Properties of Water 249548 ) Maximum Attempts: 1 Question Type: Numeric Fill In Blank Maximum Score: 5 Correct Answer: 100 Question: In degrees Celsius, the boiling point of water is _____ degrees higher than the freezing point. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: 100. Water freezes at 0¡C and boils at 100¡C. That is a difference of 100¡C. -------------------------------------------------------------------------------- Question 5c of 10 ( 1 Properties of Water 249549 ) Maximum Attempts: 1 Question Type: Numeric Fill In Blank Maximum Score: 5 Correct Answer: 0 Question: What is the freezing point (in degrees Celsius) of water? Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: 0. Water freezes at 0¡C. -------------------------------------------------------------------------------- Question 6a of 10 ( 2 Water Cycle 150564 ) Maximum Attempts: 1 Question Type: Ordering Maximum Score: 5 Question: Put these processes of the water cycle in the correct order starting from the moment the sun transfers its energy. Correct Answer: 1. The sun shines. Water evaporates into the atmosphere. 2. Water vapor condenses into liquid water and forms clouds. 3. Rain, snow, or other precipitation falls. 4. Water collects in rivers, lakes, and other bodies of water. Attempt Incorrect Feedback 1st No, that isn't it. Remember, the process is supposed to start with energy acting upon water, and end with the water coming together back to Earth. Correct Feedback That's correct! Global Incorrect Feedback The correct order is: 1. The sun shines. Water evaporates into the atmosphere. 2. Water vapor condenses into liquid water and forms clouds. 3. Rain, snow, or other precipitation falls. 4. Water collects in rivers, lakes, and other bodies of water. -------------------------------------------------------------------------------- Question 6b of 10 ( 2 Water Cycle 249555 ) Maximum Attempts: 1 Question Type: Ordering Maximum Score: 5 Question: Put these processes of the water cycle in the correct order, starting at the point where the water is in a lake. Correct Answer: 1. Water evaporates into the atmosphere. 2. Water vapor condenses into liquid water. 3. Rain, snow, or other precipitation falls. 4. Water collects into larger bodies of water. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct order is: 1. Water evaporates into the atmosphere. 2. Water vapor condenses into liquid water. 3. Rain, snow, or other precipitation falls. 4. Water collects into larger bodies of water. -------------------------------------------------------------------------------- Question 6c of 10 ( 2 Water Cycle 249556 ) Maximum Attempts: 1 Question Type: Ordering Maximum Score: 5 Question: Put these processes of the water cycle in the correct order, starting from the moment the sun transfers its energy. Correct Answer: 1. Evaporation of water 2. Formation of clouds 3. Precipitation of water 4. Collection of water Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct order is: 1. Evaporation of water 2. Formation of clouds 3. Precipitation of water 4. Collection of water -------------------------------------------------------------------------------- Question 7a of 10 ( 3 Properties of Water 338548 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match the description to the form of water that is described. Choice Text Correct Match Match Text A. Least dense form of water B. Liquid water B. Most dense form of water A. Water vapor C. Bonds hold water molecules far apart from each other C. Ice Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: Water vapor is the least dense form of water. Liquid water is the densest form of water. Bonds hold water molecules far apart from each other in ice. -------------------------------------------------------------------------------- Question 7b of 10 ( 3 Properties of Water 338549 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match the description to the form of water that is described. Choice Text Correct Match Match Text A. Molecules are farthest apart from each other B. Liquid water B. Most dense form of water A. Water vapor C. Molecules form a crystal lattice C. Ice Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: Water vapor is the least dense form of water, and the molecules are farthest apart from each other. Liquid water is the densest form of water. In ice, molecules form a crystal lattice. -------------------------------------------------------------------------------- Question 7c of 10 ( 3 Properties of Water 338550 ) Maximum Attempts: 1 Question Type: Matching II Maximum Score: 5 Question: Match the description to the form of water that is described. Choice Text Correct Match Match Text A. Molecules are not stuck together. B. Liquid water B. Molecules are attracted to each other, but not ordered. A. Water vapor C. Molecules are joined in an ordered structure. C. Ice Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answers are: In water vapor, the molecules are not stuck together. In the liquid water, they are attracted to each other, but not in an ordered structure. In ice, they are in an ordered structure. -------------------------------------------------------------------------------- Question 8a of 10 ( 2 Water Cycle 151635 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: If you continued to heat a pot of water after it reached its boiling point, what would happen? Choice Feedback A. Its temperature would rise above 100¡ C. That is not the correct answer. *B. Its temperature would stay at 100¡ C. That's correct! C. Its temperature would drop below 100¡ C. That is not the correct answer. D. Its temperature would rise above 100¡ C, then slowly drop. That is not the correct answer. Global Incorrect Feedback The answer is: Its temperature would stay at 100¡ C. Boiling water remains at its boiling point of 100¡ C. -------------------------------------------------------------------------------- Question 8b of 10 ( 2 Water Cycle 249508 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What would be the temperature of a pot of water if you continued heating it for 10 minutes after it had already started boiling? Choice Feedback A. Higher than 100¡ C That is not the correct answer. *B. 100¡ C That's correct! C. Lower than 100¡ C That is not the correct answer. D. It is impossible to tell without more information. That is not the correct answer. Global Incorrect Feedback The answer is: 100¡ C. Boiling water remains at its boiling point of 100¡ C. -------------------------------------------------------------------------------- Question 8c of 10 ( 2 Water Cycle 249518 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: How does the temperature of water change if you heat it after it has already reached the boiling point? Choice Feedback A. It increases. That is not the correct answer. *B. It does not change. That's correct! C. It decreases. That is not the correct answer. D. It increases, then slowly decreases. That is not the correct answer. Global Incorrect Feedback The answer is: It does not change. Boiling water remains at its boiling point of 100¡ C. -------------------------------------------------------------------------------- Question 9a of 10 ( 2 Properties of Water 151638 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Plants release water vapor into the air by the process of _____. Choice Feedback A. evaporation That is not the correct answer. B. transpiration That is not the correct answer. C. condensation That is not the correct answer. *D. evapotranspiration That's correct! Global Incorrect Feedback The answer is: evapotranspiration. Water moves up through a plant's stem and exits through the leaves by evapotranspiration. -------------------------------------------------------------------------------- Question 9b of 10 ( 2 Properties of Water 249509 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Plants release water vapor into the air through a combination of _____. Choice Feedback A. evaporation and sublimation That is not the correct answer. B. transpiration and condensation That is not the correct answer. C. condensation and sublimation That is not the correct answer. *D. evaporation and transpiration That's correct! Global Incorrect Feedback The answer is: evaporation and transpiration. Water moves up through a plant's stem and exits through the leaves by evapotranspiration, a combination of evaporation and transpiration. -------------------------------------------------------------------------------- Question 9c of 10 ( 2 Properties of Water 249519 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Evapotranspiration is the process of : Choice Feedback A. liquid water becoming a gas. That is not the correct answer. B. a plant absorbing water vapor. That is not the correct answer. C. water vapor becoming a liquid. That is not the correct answer. *D. a plant releasing water vapor. That's correct! Global Incorrect Feedback The answer is: a plant releasing water vapor. Water moves up through a plant's stem and exits through the leaves by evapotranspiration. -------------------------------------------------------------------------------- Question 10a of 10 ( 2 Properties of Water 153667 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: increases Question: As water is cooled, its density ______ until it reaches about 4¡ C. Attempt Incorrect Feedback 1st That's correct! Correct Feedback That's not it. Water's density increases once it get cold enough. Global Incorrect Feedback The correct answer is: increases. As water is cooled, its density increases until it reaches about 4¡ C. -------------------------------------------------------------------------------- Question 10b of 10 ( 2 Properties of Water 249611 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: 4, four Question: As water is cooled, its density increases until it reaches about _____¡ C. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: 4. As water is cooled, its density increases until it reaches about 4¡ C. -------------------------------------------------------------------------------- Question 10c of 10 ( 2 Properties of Water 249612 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: decreases Question: As water is cooled from 4¡ C to 0¡ C, its density ______. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: decreases. As water is cooled, its density increases until it reaches about 4¡ C; after that, its density decreases. --------------------------------------------------------------------------------