AIM: What is Weathering?

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Presentation transcript:

AIM: What is Weathering? Do Now – Choose one of the following pictures and describe what is/has happened. A B c E F D

breaking down rock into smaller pieces. Weathering breaking down rock into smaller pieces. What is changing about the object? More pieces = More surface area As surface area increase the rate of weathering increases(direct relationship).

changes the size and shape of the rock. II. Mechanical (Physical) Weathering changes the size and shape of the rock. a) Abrasion: rocks hitting and smashing against each other. What is making the rocks abrade in the stream?

b) Frost Wedging What happens to water when it freezes? water expands when it freezes this creates pressure that cracks the rock

c) Biological Activity - organisms(plants, animals and humans) break down rocks. (organisms abrade rocks)

changes the rocks chemical composition to create a new material. III. Chemical Weathering changes the rocks chemical composition to create a new material. - Water is the most important agent for chemical weather because most materials are soluble (can be dissolved by water).

Which minerals will react with acid? Acid Rain - water combines with different elements to make acids, known as Hydrolysis. - H2O + sulfur = sulfuric acid (acid rain) Which minerals will react with acid? acid rain damage on trees

Acid rain reacts with calcite and dolomite in the rocks (Limestone). This dissolves the rock creating Karst Topography (caves), stalactites and stalagmites.

b) Oxidation - Water and oxygen react with metal to create rust.

IV. Rate of Weathering Depends on… a) Rock Composition. Some rocks are more resistant (stronger) to weathering because of their composition (minerals). Granite Limestone

In the diagram below, which letter rock is most resistant to weathering? Hoodoo

More surface area = more places to weather b) amount of surface area affects the amount of weathering WHY? More surface area = more places to weather

c) Climate: - Temperature and moisture help determine the type and amount of weathering. - Chemical weathering is most effective in areas with high temperatures (heat) and abundant moisture (water).

Closure: In your Notes Slate Headstone Marble Headstone Explain the difference in weathering of the two headstones (roughly the same age). What caused the difference in weathering?

Cleopatra’s Needle 2) Describe one factor that explains why Cleopatra’s needle changed after it was brought from Egypt to New York. 1900 - Egypt Present Day - Central Park