What are objects made of?

------------------------- are made by people.

• Natural materials

• Human-made materials

-------------- materials are not made by people.

• Natural

• Human-made

Clothes are made of ------------------

• Rocks

• Cotton

Houses are made of ------------------------------

• Rocks

• Plastics

-------------- is a natural material.

• Plastic

• Wood

------------ is a human-made material.

• Plastic

• Wood

All kinds of plastic are hard.

• True

• False

Key is made of -----------------

• Natural materials

• Human-made materials

• Both

People use rocks to make clothes.

• True

• False

The tree is a natural material.

• True

• False