Chapter 7 Earth's Powerful Change

The breaking down rocks into smaller pieces is called?

• decay

• weathering

• expanding

• contract

Which weathering breaks down big rocks without changing the minerals they contain?

• physical

• chemical

As rocks get hot they?

• contract

• erode

• expand

As rocks cool down they?

• expand

• erode

• contract

Which of the following is a cause to physical weathering? Choose 2.

• water

• wind

• roots

• dirt

As water freezes in the cracks of rocks it causes what?

• erosion

• ice wedging

• new rocks to form

The break down of rocks by changing the minerals they contain is called?

• physical weathering

• chemical weathering

What are 2 examples of chemical weathering?

• acid rain

• roots

• animals

• oxygen

Geologist describe _______ as any process or force that moves sediments to new locations.

• weathering

• changes

• erosion

• water

A deep valley with steep sides and often a stream or river running through it is called a?

• mountain

• canyon

• cave

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