Front

area

Back

A measurement of the surface of something

Front

data

Back

Recorded measurements or observations

Front

estimate

Back

An educated guess about a number

Front

fresh water

Back

Water that is not salty, such as the water in most lakes and rivers

Front

graph

Back

An image that helps you understand information

Front

hydrosphere

Back

All the water (solid, liquid, gas) on and around planet Earth

Front

ice cap

Back

A large area of frozen water found on the surface of the Earth

Front

lake

Back

A large area of water with land all around it

Front

ocean

Back

A large area of salt water that covers the Earth

Front

salt water

Back

Water with salt in it, such as the ocean