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atmosphere

100

This is the layer of gases that surrounds the Earth and helps us breathe.

the atmosphere

200

This gas is important in the air we breathe.

oxygen

300

This layer of the atmosphere protects us from the Sun's harmful rays

the ozone layer

400

Besides oxygen, this is another gas found in the atmosphere

nitrogen

500

This weather event happens in the atmosphere when water droplets fall to the ground.

rain (or precipitation)

hydrosphere

100

This is the name for all the water on Earth, including oceans, lakes, and rivers

the hydrosphere

200

The largest body of water on Earth is called this

the ocean

300

the term for all water that falls from the sky- as snow, rain, sleet or hail

precipitation

400

Water that is frozen in large sheets at the North and South Poles is called this

glacier (or ice)

500

This process happens when water from lakes and oceans turns into vapor and goes into the air.

evaporation