Erosion

What type of changes does erosion cause?

• Physical changes

• Chemical changes

• Electrical changes

• Magnetic changes

Erosion occurs when natural forces alter the landscape. What does it mean to alter a landscape?

• To blow dust around

• To change what land looks like

• To deposit silt at the mouth of a river

• To create a floodplain

Which term best describes the rate at which glacial erosion takes place?

• Quick

• Ephemeral

• Slow

• Sudden

How do beaches form?

• Waves pounding pebbles into smaller and smaller pieces

• Wind eroding pebbles into smaller pieces

• Water freezing and thawing the cracks of the pebbles

• Rain wearing away frocks into smaller and smaller pieces

How would a sandblasted rock differ from a rock that hasn't been sandblasted?

• A sandblasted rock would be bigger

• A sandblasted rock would be smoother in shape and less jagged

• A sandblasted rock would be composed of volcanic material

• A sandblasted rock would be covered by water

Why is it hard to see glacial erosion in action?

• Because glaciers are so big

• Because light from glaciers refracts too much

• Because glaciers very, very slowly

• Because glacial erosion is usually very subtle

What do floodplains, sandbars, and river deltas have in common?

• They've all been formed by water erosion

• They've all been formed by glacial erosion

• They've all been formed by wind erosion

• They've all been formed by sandblasting

Based on the information presented in the movie, what would be a simple way to prevent erosion?

• Blocking the wind

• Planting Trees

• Preventing rainfall

• Preventing the flow of rivers

Based on the information presented in the movie, what can you infer about the type of erosion that formed the Grand Canyon?

• Wind erosion

• Water erosion

• Sandblasting

• Glacial erosion