External forces

Erosion

________ wears away Earths surface (wind, glaciers, moving water)

Drawbacks

________: Good soil can be carried away, leaving the land barren.

Chemical

________- changes the actual chemical make- up of the rock.

soil rock

Fast- moving water →cuts into land and wears away ________ → creates sediment which grinds away other rocks.

Physical

breaks the rock into smaller pieces

-Ex

Water freezes in the crack, ice splits the rock, Broken tombstone

Chemical

changes the actual chemical make-up of the rock

-Ex

Water + CO2 destruction of limestone; Mammoth Cave (carbonic acid)

-Ex

Bronze turning green when exposed to elements

-Ex

Bryce Canyon (with a little water erosion)

Benefits

Mineral-rich soil is deposited, creating fertile soil

Drawbacks

Good soil can be carried away, leaving the land barren

-Ex

Glacier National Park, Grand Tetons

-Ex

Great Lakes

Sheet

flat, broad sheets of ice (Greenland, Antarctica)

Mtn

found in high mtns

-Ex

Grand Canyon and Colorado River