Word Wall 3

Front

convection current

Back

a circular movement of fluid (such as air) that is the result of uneven heating of the fluid

Front

contract

Back

to get smaller; to take up less space

Front

expand

Back

to get bigger; to take up more space

Front

fluid

Back

a liquid or a gas

Front

less dense

Back

when an object floats in water, it is less dense than water

Front

more dense

Back

when an object has more mass for its size than another object. When an object sinks in water, it is more dense than water.