Download - Chemical Weathering
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Chemical Weathering
Aim: What factors cause chemical weathering?
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Describe what you see and hypothesize how it got this way…
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What happened to lady liberty?
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1. Chemical weathering
a. Rock is broken down by chemical changes
b. Rock is changed to different minerals and becomes weaker.
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When you think chemical weathering, think chemical changes:
Acid,
Dissolving,
Rusting,
Corrosion
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2. Causes of chemical weathering:
A. Water
B. Oxygen
C. Carbon dioxide
D. Living organisms
E. Acid rain
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A. Water ***Most Important Factor***
Water dissolves minerals in rocks
OR
changes the material into a different mineral
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Ex. - Caves
Limestone is dissolved by water. Caves, stalactites and stalagmites can form.
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Ex. - Sink Holes
Surface water seeps down and dissolves away the rock.
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B. Oxidation Iron combines with oxygen when water is
present causing rust Rock gets soft and crumbly and has a red
or brown color
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C. Carbonation Carbon dioxide in air mixes with rainwater
forming carbonic acid Acid reacts with marble and limestone
(remember the fizzing mineral!)
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D. Living Organisms
Lichens are an organism that will grow on rocks and release an acid that cause chemical weathering.
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E. Acid Rain
created when pollution from burning fossil fuels mixes with rain water
Acid rain dissolves rocks over time
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Devil’s Marbles
Huge slabs of granite chemically weathered by water in the cracks gives them this rounded appearance.
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Lady Liberty
The copper coating on the statue oxidize and turned green
Pennies go through the same chemical change
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Which chemical weathering agents may have contributed to Cleopatra’s needle change?
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HW Read pgs 42-45Answer question # 4 on pg. 45 and the question below.
4.Why does chemical weathering occur faster in hot wet climates than in cool, dry, climates?
How does rock type affect the rate of weathering?