( 3 Ocean Characteristics 185189 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why is the bottom layer of the ocean the coldest? Choice Feedback *A. Cold water is denser than warm water. That's correct! B. Warm water is denser than cold water. That's not it. Actually, cold water is denser than warm water. C. Salty water is denser than pure water. That's not it. This is true, but there is no pure water in the ocean, and this doesn't explain why the bottom is coldest. D. The transition zone contains pure water. That's not it. There is no layer of pure water in the ocean. Global Incorrect Feedback The correct answer is: Cold water is denser than warm water. -------------------------------------------------------------------------------- Question 1b of 10 ( 3 Ocean Characteristics 250052 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why is the bottom layer of the ocean the coldest? Choice Feedback *A. Cold water sinks, while warm water rises. That's correct! B. Warm water is denser than cold water, which makes it rise. That's not it. Actually, cold water is denser than warm water. C. Salty water is denser than pure water. That's not it. This is true, but there is no pure water in the ocean, and this doesn't explain why the bottom is coldest. D. The twilight zone contains saltwater. That's not it. All layers of the ocean contain saltwater. Global Incorrect Feedback The correct answer is: Cold water sinks, while warm water rises. -------------------------------------------------------------------------------- Question 1c of 10 ( 3 Ocean Characteristics 250060 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why is the top layer of the ocean the warmest? Choice Feedback *A. Warm water is less dense than cold water. That's correct! B. Warm water is denser than cold water. That's not it. Actually, cold water is denser than warm water. C. Salty water is less dense than pure water. That's not it. This is not true, and also, there is no pure water in the ocean. D. The mixed zone contains saltwater. That's not it. All layers of the ocean contain saltwater. Global Incorrect Feedback The correct answer is: Warm water is less dense than cold water. -------------------------------------------------------------------------------- Question 2a of 10 ( 3 Ocean Characteristics 185190 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Why do oceanographers take measurements of the conductivity of the seawater? Choice Feedback A. Conductivity tells water temperature. That's not it. They can measure the temperature directly. *B. Conductivity can be used to calculate the salinity of the water. That's correct! C. Conductivity helps oceanographers avoid dangerous electrical situations. That's not it. This is not true. D. Conductivity tells how much marine life is in the water. That's not it. The conductivity cannot tell you that. Global Incorrect Feedback The correct answer is: Conductivity can be used to calculate the salinity of the water. -------------------------------------------------------------------------------- Question 2b of 10 ( 3 Ocean Characteristics 250053 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: By using information about the temperature and salinity of ocean water, oceanographers can determine the _____. Choice Feedback A. habitability That's not it. The habitability is not measured in this way. *B. density That's correct! C. depth That's not it. They can measure the depth much more easily than this. D. mass That's not it. They generally do not measure ocean mass. Global Incorrect Feedback The correct answer is: Oceanographers use salinity and temperature to determine density. -------------------------------------------------------------------------------- Question 2c of 10 ( 3 Ocean Characteristics 250061 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: How do oceanographers measure the salinity of ocean water? Choice Feedback A. By measuring the depth of the water. That's not it. This does not tell you the salinity. *B. By measuring the conductivity of the water. That's correct! C. By measuring the density of the water. That's not it. This is not true. D. By measuring the amount of marine life present. That's not it. The amount of marine life does not tell you this. Global Incorrect Feedback The correct answer is: By measuring the conductivity of the water. -------------------------------------------------------------------------------- Question 3a of 10 ( 2 Ocean Characteristics 185191 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which of these zones of the ocean is most hospitable to life? Choice Feedback A. Bathypelagic That's not it. This is the midnight zone, where there is not light. B. Hadalpelagic That's not it. This is the least hospitable, because it is the deepest. *C. Epipelagic That's correct! D. Abyssopelagic That's not it. This is a very deep zone, so it is not very hospitable. Global Incorrect Feedback The correct answer is: Epipelagic. -------------------------------------------------------------------------------- Question 3b of 10 ( 2 Ocean Characteristics 250054 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which of these zones of the ocean is deepest? Choice Feedback A. Bathypelagic That's not it. This is the midnight zone, where there is no light. B. Epipelagic That's not it. This is the top layer of the ocean. *C. Hadalpelagic That's correct! D. Abyssopelagic That's not it. There is one layer deeper than this. Global Incorrect Feedback The correct answer is: Hadalpelagic. -------------------------------------------------------------------------------- Question 3c of 10 ( 2 Ocean Characteristics 250062 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: Which of these zones is also known as the midnight zone? Choice Feedback A. Epipelagic That's not it. This is the top layer of the ocean. B. Hadalpelagic That's not it. This is the bottom of the ocean. *C. Bathypelagic That's correct! D. Abyssopelagic That's not it. This is known as the abyss. Global Incorrect Feedback The correct answer is: Bathypelagic. -------------------------------------------------------------------------------- Question 4a of 10 ( 1 Waves 185192 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: wavelength, wave length, wavelenth, wave lenth Question: The term for the distance between two crests of a water wave is the _____. Attempt Incorrect Feedback 1st That's not it. Draw yourself a picture of a wave to help remember. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: wavelength. -------------------------------------------------------------------------------- Question 4b of 10 ( 1 Waves 250083 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: wave period, waveperiod Question: The term for the time it takes each wave crest to pass a certain point is called the _____. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: wave period. -------------------------------------------------------------------------------- Question 4c of 10 ( 1 Waves 250084 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: fetch Question: The term for the distance over which wind blows uninterrupted is called the _____. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: fetch. -------------------------------------------------------------------------------- Question 5a of 10 ( 2 Waves 185193 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: How do waves change as they approach the shore? Choice Feedback A. The wavelength increases. That's not it. The wavelength decreases. B. The height decreases. That's not it. The height of a wave increases until the wave finally breaks. *C. The distance between crests decreases. That's correct! D. Friction along the top of the wave increases. That's not it. Friction along the top of the wave does not change, because it is not touching anything. Global Incorrect Feedback The correct answer is: The distance between crests decreases. -------------------------------------------------------------------------------- Question 5b of 10 ( 2 Waves 250055 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: How do waves change as they approach the shore? Choice Feedback A. The distance between crests increases. That's not it. The distance decreases. B. Friction along the bottom of the wave decreases. That's not it. Actually, friction along the bottom of the wave increases. *C. The wavelength decreases. That's correct! D. Friction along the top of the wave increases. That's not it. Friction along the top of the wave does not change, because it is not touching anything. Global Incorrect Feedback The correct answer is: The wavelength decreases. -------------------------------------------------------------------------------- Question 5c of 10 ( 2 Waves 250063 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: How do waves change as they approach the shore? Choice Feedback A. The wavelength increases. That's not it. The wavelength decreases. B. The distance between crests increases. That's not it. The distance decreases. *C. The height increases. That's correct! D. Friction along the top of the wave increases. That's not it. Friction along the top of the wave does not change, because it is not touching anything. Global Incorrect Feedback The correct answer is: The height increases. -------------------------------------------------------------------------------- Question 6a of 10 ( 2 Ocean Characteristics 185194 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: spring, spring tide Question: When the tides are especially strong due to the alignment of the sun and moon, it is called a _____ tide. Attempt Incorrect Feedback 1st That's not it. There are two kinds of special tides. Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: spring. -------------------------------------------------------------------------------- Question 6b of 10 ( 2 Ocean Characteristics 250085 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: neap, neap tide Question: When the gravitational pulls of the sun and moon partially cancel each other out, Earth experiences a _____ tide. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: neap. -------------------------------------------------------------------------------- Question 6c of 10 ( 2 Ocean Characteristics 250086 ) Maximum Attempts: 1 Question Type: Text Fill In Blank Maximum Score: 5 Is Case Sensitive: false Correct Answer: neap, neap tide Question: When the tides are especially weak, it is called a _____ tide. Attempt Incorrect Feedback 1st Correct Feedback That's correct! Global Incorrect Feedback The correct answer is: neap. -------------------------------------------------------------------------------- Question 7a of 10 ( 2 Ocean Currents 185204 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What causes deep-water currents? Choice Feedback A. Wind That's not it. Wind causes surface currents. *B. Temperature differences in water That's correct! C. Earth's rotation That's not it. Earth's rotation does not cause the currents. D. The Coriolis effect That's not it. The Coriolis effect changes their direction, but does not cause the currents. Global Incorrect Feedback The correct answer is: Temperature differences in water. -------------------------------------------------------------------------------- Question 7b of 10 ( 2 Ocean Currents 250056 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What causes upwelling? Choice Feedback A. Longshore currents That's not it. Longshore currents do not cause upwelling. *B. Wind That's correct! C. Earth's rotation That's not it. Earth's rotation does not cause the currents. D. The Coriolis effect That's not it. The Coriolis effect changes their direction, but does not cause the currents. Global Incorrect Feedback The correct answer is: Wind. -------------------------------------------------------------------------------- Question 7c of 10 ( 2 Ocean Currents 250064 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What causes currents to flow between the poles and the equator? Choice Feedback A. Tsunamis That's not it. *B. Uneven solar heating That's correct! C. Earth's rotation That's not it. Earth's rotation does not cause the currents. D. The Coriolis effect That's not it. The Coriolis effect changes their direction, but does not cause the currents. Global Incorrect Feedback The correct answer is: Uneven solar heating. -------------------------------------------------------------------------------- Question 8a of 10 ( 3 El Nino and La Nina 185205 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What is an effect of La Ni–a? Choice Feedback A. Australia may have a drought. That's not it. Australia usually has a drought during El Ni–o. *B. Indonesia may have unusually high rainfall. That's correct! C. Fish populations off the coast of Peru decrease. That's not it. The opposite happens. D. Alaskan fish populations decrease. That's not it. La Ni–a does not directly effect fish populations in Alaska. Global Incorrect Feedback The correct answer is: Indonesia may have unusually high rainfall. -------------------------------------------------------------------------------- Question 8b of 10 ( 3 El Nino and La Nina 250057 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What is an effect of La Ni–a? Choice Feedback A. Florida That's not it. Florida is not directly affected by La Ni–a. *B. South America becomes drier than normal. That's correct! C. Fish populations off the coast of Peru decrease. That's not it. The opposite happens. D. Alaskan fish populations increase. That's not it. La Ni–a does not directly effect fish populations in Alaska. Global Incorrect Feedback The correct answer is: South America becomes drier than normal. -------------------------------------------------------------------------------- Question 8c of 10 ( 3 El Nino and La Nina 250065 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What is an effect of La Ni–a? Choice Feedback A. The trade winds blow eastward. That's not it. This may happen during El Ni–o. *B. Ocean temperatures off the west coast of South America decrease. That's correct! C. Fish populations off the coast of Peru decrease. That's not it. The opposite happens. D. Ocean temperatures off the east coast of South America increase. That's not it. La Ni–a does not directly effect the east coast of South America. Global Incorrect Feedback The correct answer is: Ocean temperatures off the west coast of South America decrease. -------------------------------------------------------------------------------- Question 9a of 10 ( 2 Ocean Currents 185206 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: In what way does ocean water move globally? Choice Feedback A. Along cold-water currents from the equator to the Poles That's not it. Cold-water currents flow from the Poles to the equator. *B. Along warm-water currents from the equator to the Poles That's correct! C. From the warm Western hemisphere to the cold Eastern hemisphere That's not it. The Western and eastern hemispheres do not have a general temperature difference. D. From low-pressure systems to high-pressure systems That's not it. Pressure affects the direction of wind. Global Incorrect Feedback The correct answer is: Along warm-water currents from the equator to the Poles. -------------------------------------------------------------------------------- Question 9b of 10 ( 2 Ocean Currents 250058 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: In what way does ocean water move globally? Choice Feedback A. Along cold-water currents from the equator to the Poles That's not it. Cold-water currents flow from the Poles to the equator. *B. Along cold-water currents from the Poles to the equator That's correct! C. From the cold Western Hemisphere to the warm Eastern Hemisphere That's not it. The Western and Eastern hemispheres do not have a general temperature difference. D. From high-pressure systems to low-pressure systems That's not it. Pressure affects the direction of wind. Global Incorrect Feedback The correct answer is: Along cold-water currents from the Poles to the equator. -------------------------------------------------------------------------------- Question 9c of 10 ( 2 Ocean Currents 250066 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: In what way does ocean water move globally? Choice Feedback A. Along cold-water currents from the equator to the Poles That's not it. Cold-water currents flow from the Poles to the equator. *B. Along warm-water currents from warmer regions to colder regions That's correct! C. Along longshore currents from the equator to the Poles. That's not it. Longshore currents are not global. D. Along cold-water currents from warmer regions to colder regions That's not it. This is not how it flows. Global Incorrect Feedback The correct answer is: Along warm-water currents from warmer regions to colder regions. -------------------------------------------------------------------------------- Question 10a of 10 ( 2 El Nino and La Nina 185207 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What unusual pattern occurs during El Ni–o? Choice Feedback A. Cool water flows south along the east coast of South America. That's not it. El Ni–o does not directly affect the southern flow of water along the coast. B. Warm water flows north along west coast of South America. That's not it. El Ni–o does not directly affect the northern flow of water along the coast. C. The trade winds strengthen. That's not it. The trade winds weaken during El Ni–o. *D. Warm water flows from the western tropical Pacific toward South America. That's correct! Global Incorrect Feedback The correct answer is: Warm water flows from the western tropical Pacific toward South America. -------------------------------------------------------------------------------- Question 10b of 10 ( 2 El Nino and La Nina 250059 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What unusual pattern occurs during El Ni–o? Choice Feedback A. Cool water flows north along the east coast of South America. That's not it. El Ni–o does not directly affect the northern flow of water along the east coast. B. Warm water flows from South America to the west tropical Pacific. That's not it. The opposite of this happens. C. Cool water flows from the western tropical Pacific toward South America. That's not it. Warm water actually flows in this way during El Ni–o. *D. The trade winds weaken, or even blow backwards. That's correct! Global Incorrect Feedback The correct answer is: The trade winds weaken, or even blow backwards. -------------------------------------------------------------------------------- Question 10c of 10 ( 2 El Nino and La Nina 250067 ) Maximum Attempts: 1 Question Type: Multiple Choice Maximum Score: 5 Question: What unusual event occurs during El Ni–o? Choice Feedback A. Warm water flows south along the east coast of South America. That's not it. El Ni–o does not directly affect the southern flow of water along the coast. B. There is unusually low pressure in the western tropical Pacific. That's not it. The opposite is true. C. The trade winds blow harder to the west. That's not it. The trade winds weaken during El Ni–o. *D. The pressure gradient decreases. That's correct! Global Incorrect Feedback The correct answer is: The pressure gradient decreases. --------------------------------------------------------------------------------