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Weathering & Erosion
when rock is broken down into smaller pieces
pieces of rock broken down by weathering
2 types of weathering
mechanical and chemical
rocks are physically broken into smaller pieces, small pieces are the same type as large rock
water freezes and melts and freezes again in cracks of rock breaking it open
mechanical weathering by moving water
mechanical weathering by glaciers
can be caused by water, wind, ice, growing plants, and animals
rocks are broken down by chemical changes into a new type of rock or substance. Never again the same!
carbon dioxide and water form a weak acid that dissolves rock
Carlsbad Cavern and Mammoth Cave
formed from chemical and mechanical weathering. Acid dissolved the rock.
plant roots can give off acids that dissolve rocks
oxygen and water combine to chemically change rocks. Can rust certain types of rocks
can cause mechanical weathering of rocks
the movement of rocks or sediment, the escape
wind, water, gravity
can cause erosion
gravity causing rocks and mountain sides to sink or fall downhill
the dropping of sediment by wind, water, or ice
deposits made by glaciers
floodplain or deltas
formed by rivers dropping their sediment; deposition
move sand on and off the beach, can form barrier islands
current moving parallel to shore and moves sand