Oxford Discover (2) - Unit 2 How matters change

They are hard or soft. We can see and feel them. What are these matters?

• liquids

• gases

• solids

They can flow, and can be thick or thin. What are these matters?

• liquid

• gases

• solids

We can't usually see them, but sometimes we can feel cold or hot when they moves. They are the things we breathe . What are they?

• liquids

• gases

• solids

What happens to water, when it is very cold?

• It freezes.

• It melts.

• It changes to steam.

• It boils.

Why does ice melt?

• Because we boil it.

• Because the temperature is low.

• Because it freezes.

• Because it gets heated.

When does water change to steam?

• when it melts

• when it freezes

• when it boils

How many different states does everything usually come in?

• Everything in our world comes in four different states.

• Everything in our world comes in three different states.

• Everything in our world comes in two different states.

• Everything in our world comes in the same state.