Question

Which of the following statements is true?

The troposphere is made of layered gases.
In the water cycle, the amount of water which evaporates equals the amount of water which falls as precipitation.
Burning fossil fuels increases the amount of ozone in the atmosphere.
Nitrogen is added to oceans by special nitrifying bacteria.

Answer 1

On a global scale, the amount of water evaporating is about equal to the amount which falls as precipitation.