Weathering and Erosion

What has caused sudden changes to the earth's surface?

• volcanoes and earthquakes

• lakes and streams

Changes to the earth's surface usually happen over a long period of time.

• true

• false

What breaks down rocks into smaller pieces?

• water

• wind

• ice

• plants

• all of the above

Natural arches and bridges are caused by ___________.

• chemical weathering

• physical weathering

Erosion is the movement of ____________ materials.

• sand

• weathered

• wet

• green

_______ are formed by rivers eroding rock.

• canyons

• ponds

• plateaus

_____ occurs when sediment is dropped off.

• rain

• deposition

• erosion

The face of the earth is always __________.

• growing

• changing

• shrinking