Comprehension Check 5-6

What is the layer of air surrounding the earth called?

The atmosphere.

In which of the three states of matter does air exist naturally?

Gas.

Which of the gases in air is the most plentiful?

Nitrogen.

Why is oxygen important for people, animals, and plants?

People and animals need to breathe it to survive, and plants need to use it to make food for them to eat so that they don't starve.

Which gas do plants take from the air in order to make food?

As I stated before oxygen.

What keeps the blanket of air around the earth?

Earth's gravity.

Besides the atmosphere, where would you find air?

Some air can be found inside of the soil in the ground, and there is also quite a bit of air dissolved in to water.