The heavy rocks on the surface can be pressed and folded by the heat within the earth.

We can also change the size, shape, and texture of materials​ by bending, pressing, cutting, hammering or burning.

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​Changing Matter

Solid materials can be bent.

This is a kind of physical change since no new material is formed.

Hard materials like aluminum, brass, and steel can be bent by special tools.​

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Bending

Solid materials can also be pressed.

This process changes their size and shape.

It is still a physical change.

Elastic materials may return to their original shape after pressing.

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​Pressing

The size and shape of a material may also be changed by hammering.

A hammer is a tool with a heavy metal mounted at the end of a handle.

It is a physical change.​

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​Hammering

The size and shape of a solid material can also be changed by cutting.

Tools ​like scissors and cutters are necessary to cut materials.​

​Cutting