Grade 5 - Unit 5 - Part 1

A mixture of gases that surround the planet.

How much is oxygen in the atmosphere?

• 78%

• 21%

• 1%

• 0.1%

When water in the air cools down and forms drops.

When liquid turns into a gas or steam.

Water that is found in lakes and rivers and contains almost no salt.

How much of the Earth’s water is drinkable?

• around 1%

• around 1.2%

• around 0.12%

• around 10.2%

Rain, sleet, hail, or snow

Water that starts as rain or snow on land, and ends up going in the ocean.

The process by which Earth’s water changes form and is reused again.

A region of land where the precipitation drains into a lake or river or a habitat that surround a river or stream.