Changes to the Earths Surface

What force creates an U-shaped valley?

• Rivers

• Waves

• Glaciers

• Wind

The process by which water, ice, wind or gravity moves weathered rock and soil from one place to another.

• weathering
• erosion
• deposition
• dumptruck

How are canyons formed?

• Wind blows sand into high piles, which form the canyon walls.
• Rivers erode soil and rock over time, leaving behind canyon walls.
• Gravity causes rocks to fall from mountain sides onto valley floors.
• Ice freezes and thaws in cracks of rocks, and the cracks become canyons.

Weeds growing into the cracks in a sidewalk and the sidewalk begins to crumble is an example of:

• weathering
• erosion
• deposition
• nothing

A cliff formed near the ocean.  Which statement best describes how this cliff was formed?

• A river eroded the rock.
• Sun rays evaporated the rock.
• Ocean waves weathering the rock.
• Plant roots pushed away the rock.

Deposition changes the Earth’s surface because eroded materials _____.

• stop the river's flow
• make rich farmlands
• are dropped in new places
• move very slowly

How might a mountain weathered over eons appear different than a mountain that has never been weathered?

• Weathered mountain would be taller.

• Weathered mountain would be rounder and less jagged.

• Weathered mountain would be more jagged and less rounded.

• Weathered mountain would have no trees.

Deposited material at the end of a river is called?

• landform
• delta
• canyon
• sand dune

Water getting into cracks, freezing, and breaking the rocks or pavement apart is called?

• Weathering
• Erosion
• Deposition

These rocks were broken apart from the continuous freezing and thawing of water in the cracks of the rocks. This is an example of:

• ice

• acid rain

• glacier

• abrasion