Over the past 150 years, the levels of carbon dioxide in the atmosphere has

Increased carbon dioxide may cause global warming by

Earth's ozone layer

Which of the following explains the principle behind the difference in sunlight received by Earth?

In general, how do Earth systems react to change?

A closed system is a system in which the only thing exchanged with the surroundings is

Which of the following is NOT an important energy source for Earth system?

Which of the following is NOT involved in the movement of matter and energy between reservoirs?

The part of Earth where life exists

The portion of Earth that is water

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