WEATHERING.

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Presentation transcript:

WEATHERING

Mechanical weathering Frost wedging Exfoliation Plant roots abrasion

exfoliation

Plant roots

What happened to these Rocks? Abrasion

Abrasion?

Chemical Weathering Oxidation Hydrolysis Dissolution Plant acids

oxidation Metallic elements chemically react with oxygen The oxidation (rusting) of metals corrodes (weakens) the metals

Dissolution Rocks rich in the mineral calcite (like limestone) are especially vulnerable to chemical weathering. Carbonic acid slowly dissolves the limestone and enlarges cracks, ultimately enlarging them to such an extent that caverns are formed!

Acid Rain Acid rain is rain or any other form of precipitation that is unusually acidic. (rain is naturally slightly acidic (5.6) because carbon dioxide and water in the air react together to form carbonic acid, a weak acid “acid rain” refers to precipitation with an pH of lower than 5.6.

pH Scale DRAW this Scale Acidic Neutral Basic

pH Scale The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.