Question

Earth’s atmosphere is mostly nitrogen, which makes up about 78 percent of the atmosphere, and
, which makes up about 21 percent.
in the air condenses around tiny particles, causing clouds and rain. The gas
exists in small amounts but is very important because plants use it to make food.

Answer 1

Earth’s atmosphere is mostly nitrogen, which makes up about 78 percent of the atmosphere, and oxygen, which makes up about 21 percent. Water vapor in the air condenses around tiny particles, causing clouds and rain. The gas carbon dioxide exists in small amounts but is very important because plants use it to make food.