Weathering
Erosion
Chemical Weathering
Horizons
Deposition
True
Freezing and thawing (Water enters the small cracks in rocks, freezes, and then expands. This causes the cracks to widen.)
Exfoliation (Layers of heavy rock wear away. You can see many layers of the rock.)
Plants or roots (A tree's roots force their way in rock. The roots grow, and the cracks widen and break the rock apart.)
Abrasion (Winds carry bits of sand that break apart the soft part of rocks.)
FALSE. Chemical weathering occurs when the minerals in rocks chemically react with oxygen, acids, or carbon dioxide.
Oxygen (Oxygen + Water + Iron = Rust)
Carbon dioxide (Carbonic acid forms when carbon dioxide and rain water mix together. It reacts with minerals in rocks.)
Acids (Water soaking into soil disssolves acids that react with the minerals in rocks.)
Chemical weathering changes the minerals that make up a rock. Physical weathering does not-- it only changes the shape and size of rocks.