Weathering of Rocks.

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Presentation transcript:

Weathering of Rocks

Weathering The change in the physical form or chemical composition of rock materials exposed at the earth’s surface.

Go to pg. 219-223. Fill in the table 13.2 Weathering Mechanical weathering: processes physically break rock into smaller pieces, but do not change chemical composition. Chemical weathering: processes break down rock by changing its chemical composition. Go to pg. 219-223. Fill in the table 13.2

Occurs when water seeps into cracks or joints in rocks and freezes. (EXPANDS as it freezes).

Exfoliation Sheets of rock peel or flake off.

Plant Roots Roots of plants and trees find way through cracks in rocks and break apart.

Abrasion Collision of rocks with one another, breaks and wears away surfaces.

Oxidation Metallic elements combine with Oxygen. (Rusting occurs)

Hydrolysis Change of rock composition as it reacts with Water.

Dissolution Dissolving away of rock material.

Plant Acids Mosses and Lichens produce weak acids that break down rock.

The Price of Corrosion Go to pg. 223 OBJECTIVE 17.8 Read the article “The Price of Corrosion” Answer the three questions that follow on your objective notes

HOMEWORK Objective’s 17.9 + 17.10 Pg. 224-226