Section 12.1 WEATHERING. TWO TYPES: ·Physical Weathering: ·Chemical Weathering: rocks are broken...
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Transcript of Section 12.1 WEATHERING. TWO TYPES: ·Physical Weathering: ·Chemical Weathering: rocks are broken...
WEATHERING
TWO TYPES:
·Physical Weathering:
·Chemical Weathering:
rocks are broken down without a chemical reaction.
chemical reaction occurs changing the composition of the rock
Ice and water frost wedging – water
seeps into cracks in rock
expands when it freezes causing the crack to expand
Mechanical Weathering
Which type of climate has the greatest amount of rock weathering caused by frost wedging?
1 a dry climate in which temperatures remain below freezing
2 a dry climate in which temperatures alternate from below freezing to above freezing
3 a wet climate in which temperatures remain below freezing
4 a wet climate in which temperatures alternate from below freezing to above freezing
Checkpoint #1
The picture (see image) shows a geological feature in the Kalahari Desert of southwestern Africa. Which process most likely produced the present appearance of this feature?
1 Wind Erosion
2 Volcanic Eruption
3 Earthquake Vibrations
4 Plate Tectonics
Checkpoint #2
The diagram shows the stump of a tree whose root grew into a small crack in bedrock and split the rock apart.
The action of the root splitting the bedrock is an example of
1 Chemical Weathering
2 Deposition
3 Erosion
4 Mechanical Weathering
Checkpoint #3
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1201/es1201page01.cfm
Mechanical Weathering
Think: After thousands of years Cleopatra's Needle looked like the picture on the left. After 100 years in NYC it looks like the picture on the right. Why do you believe this happened?
Pair: Discuss this with someone near you
Share: Be ready to be called on to share your answers
Think-Pair-Share
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1202/es1202page01.cfm