Science Earth´s Water

What color is Earth seen from space?

• brown

• green

• yellow

• blue

What kind of water covers most of Earth´s surface?​ (a)   ​

• salt
• fresh
• clean
• cold

How are salt water and fresh water different?

• Salt water has dissolved water in it and fresh water has little or no salt in it.

• Salt water is green and fresh water is blue.

• Salt water is hot and fresh water is cold.

• Salt water is healthy and fresh water is unhealthy.

What do humans use fresh water for?​ (a)   ​ (b)   ​ (c)   ​ (d)  

• drink
• take a shower
• fish
• surf
• cook
• water the plants

Water can be ​ (a)   , ​ (b)   or a gas. Its form depends on its ​ (c)   . Most water on Earth is​ (d)   . You can see liquid water in rivers, ​ (e)   and oceans. It also falls as rain.

• a solid
• a liquid
• temperature.
• liquid
• lakes

Water in its solid form is __________. Water freezes when its termperature is below 0°C.

• hot

• melting

• ice

Water can also exist as a gas. The gas is _______ _________. It is all around you. but you can´t see it.

Water changes all the time. When you heat liquid , it can (a)   . Evaporation is the change from a liquid to a ​ (b)   . When you cool the gas, it can ​ (c)   . Condensation is the change from a gas to a ​ (d)   .

• evaporate
• gas
• condense
• liquid

What can happen to liquid water if it cools a lot?

• It can freeze.

• It can boil.

• It can evaporate.

• It can go away.

All living things use water to stay alive. People use it everyday but it never runs out. Why? Because Earth ​ (a)   its water

in the (b)   . Its the movement of water from Earth´s surface to the ​ (c)   and back again.

• recycles
• water cycle
• air