Question

1. what is the difference between halocline and thermocline? (a) thermocline is a layer where salinity changes, halocline is a layer where temperature changes (b) thermocline is a layer where temperature changes, halocline is a layer where salinity changes (c) thermocline and halocline measure the same thing, temperature (d) thermocline and halocline measure the same thing, salinity 16. why is the ocean colder the deeper you go? (a) the water is more dense and sunlight only penetrates the surface level (b) the water is more dense and sunlight penetrates all the way to the bottom (c) the water is less dense and sunlight only penetrates the surface level (d) the water is less dense and sunlight penetrates all the way to the bottom 17. what is the most abundant greenhouse gas? (a) carbon dioxide (b) methane (c) water vapor (d) hydrofluorocarbons 18. why is the greenhouse effect important? (a) it is not important, it causes global warming (b) the greenhouse effect helps maintain liquid water, which is essential for life (c) the greenhouse effect contributes to the coriolis effect (d) none of the above 19. true or false, positive feedback loops are always a good thing. (a) true (b) false 20. what is the most potent greenhouse gas? (a) hcfcs and hfcs (b) carbon dioxide (c) methane (d) water vapor

Explanation:

1. A thermocline is a layer in a body of water where temperature changes rapidly with depth, while a halocline is a layer where salinity changes rapidly.
2. Deeper ocean water is colder because water density increases with depth and sunlight only penetrates the surface - level waters, not reaching the deeper layers.
3. Water vapor is the most abundant greenhouse gas in the Earth's atmosphere.
4. The greenhouse effect is important as it helps maintain liquid water on Earth, which is essential for life. It traps heat in the atmosphere.
5. Positive - feedback loops are not always a good thing. They can amplify changes in a system, sometimes leading to instability.
6. HCFCs (hydrochlorofluorocarbons) and HFCs (hydrofluorocarbons) are among the most potent greenhouse gases in terms of their global - warming potential per molecule.

Answer:

1. b) Thermocline is a layer where temperature changes, Halocline is a layer where salinity changes
2. a) The water is more dense and sunlight only penetrates the surface level
3. c) Water Vapor
4. b) The Greenhouse effect helps maintain liquid water, which is essential for life
5. b) False
6. a) HCFCs and HFCs