Which of the following are true statements about cycles of some of the Earth's major components?

Question

Which of the following are true statements about cycles of some of the Earth's major components? (There may be more than one correct answer.)

A. Oxygen and water vapor are the two most abundant gases in the atmosphere.
B. Salt water and fresh water move through separate water cycles.
C. Oxygen generally cycles through three different states - solid liquid and gas.
D. Atmospheric nitrogen is abundant, but not very useful to life. Before it can be used it must be "fixed" and converted to a secondary form.
E. The cycling of carbon, nitrogen, and oxygen involves members of the plant kingdom.

Answer 1

D. Atmospheric nitrogen is abundant, but not very useful to life. Before it can be used it must be "fixed" and converted to a secondary form.

and

E. The cycling of carbon, nitrogen, and oxygen involves members of the plant kingdom.

- A is incorrect because the two most abundant gases in the atmosphere are nitrogen and oxygen.
- B is incorrect because both salt water and fresh water go through the process of evaporation.
- C is incorrect because it is liquid that can be solid, liquid, or a gas.

Answer 2

Not A. Most of the atmosphere is nitrogen.
Not B. All of Earth's water is in the water cycle.
Not C. Oxygen can be in different compounds and be in solid (carbohydrates, lipids, ...), in liquid water, and in gaseous oxygen. But elemental oxygen is not in all these forms.

D. is correct
E. is correct

Answer 3

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