Weathering.

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Presentation transcript:

Weathering

Weathering Weathering is the process that breaks down rock and other substances at Earth’s surface. #10

Weathering Weathering is the breaking apart of rock. #11

Two main types of weathering Mechanical Chemical #12

Mechanical weathering is breaking down rocks by physical force. #13

Mechanical Weathering Ice wedging – This occurs when water fills a crack or pore, expands because it freezes and splits the rock apart.

Mechanical Weathering Exfoliation – Layers of rock that breaks because of pressure from below.

Mechanical Weathering Organisms

3 types of mechanical weathering:#14 1. Ice Wedging 2. Exfoliation 3. Organisms

Chemical weathering is the breakdown of rocks by chemical reactions that change the rocks makeup or composition. #15

Chemical weathering includes #16 (part) dissolution (soluble rocks and minerals dissolve in acidic waters)

Chemical weathering includes #16 (part) hydrolysis (feldspars alter to clay)

Hydrolysis is the chemical weathering that refers to a chemical change to a substance when it interacts with water. #17

Water is the main cause of chemical weathering. #18

Chemical weathering includes #16 (part) oxidation (rusting of iron)

Chemical weathering includes #16 Chemical weathering includes dissolution (soluble rocks and minerals dissolve in acidic waters), hydrolysis (feldspars alter to clay), and oxidation (rusting of iron).

Why is the dirt red on Mars? #19 The dirt on Mars is red because of rust / oxidation. This is an example of chemical weathering.

Acid rain causes rocks to weather much faster than they would naturally. #20

Review What is weathering?

Review What are the two main types of weathering?

Review What is chemical weathering? Examples?

Review What is mechanical weathering? Examples?

Review What is the main cause of chemical weathering?

Review Why do scientist think the cause of Mars’ red color?