Air is matter
It takes up space and has weight.
The main gasses in the air are
nitrogen and oxygen
The Earth's atmosphere is divided into how many layers?
Animals give off carbon dioxide...
which plants use to make food... plants give off oxygen, which animals need to survive.
holds heat close to Earth's surface and protects living things from the Sun's harmful rays.
There are how many states of water?
Cooling water causes condensation, a change from gas to liquid...
When liquid water freezes, it changes into ice.
The water cycle is?
The movement of water into the air as water vapor falls back to Earth as precipitation.
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