Warm-up: 11/13/12 Weathering is the physical breakdown of rocks. Can you guess what types of weathering happened here? #1 #2.

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Presentation transcript:

Warm-up: 11/13/12 Weathering is the physical breakdown of rocks. Can you guess what types of weathering happened here? #1 #2

WEATHERING NOTES

Mechanical Weathering The physical breakdown of rocks

TYPES OF MECHANICAL WEATHERING

Freezing and Thawing Water in rock’s crack freezes, expands, and breaks the rock apart

Abrasion (Wind or Water) Rocks and Sand rubbing on each other via wind and/or water

Animal Action Various animal behaviors breakdown rocks

Plant Growth Plant’s roots burrow into cracks, grow, and break rocks apart

Release of Pressure Outer layers of rock are removed, releasing pressure and causing cracking on the rock

Chemical Weathering The breakdown of rocks through chemical changes Caused by water, carbon dioxide, oxygen, living organisms, and acid rain

EXAMPLES OF CHEMICAL WEATHERING

Parts of rocks dissolve in water

Water and oxygen cause some rocks to rust and crumble (oxidation)

Carbon dioxide and acid rain can dissolve soft rocks