Forces that Change Earth’s Crust
Name: ___________________________________________________________ Period: _____ Date: _______________
Essential Question: How is the Earth’s crust changed or renewed?
1. What are the forces that change Earth’s crust?
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2. How is weathering and erosion responsible for this rock formation?
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3. Why are the rocks rounded and smooth?
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4. What are the forces that changes Earth’s crust slowly and rapidly?
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5. How do landforms change?
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6. What are the three types of stresses inside Earth?
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7. What is the difference Earth’s stress and strain?
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8. What are the different types of deformation.
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9. How is the Earth’s crust affected by weathering?
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10. What type of climate is favorable for weathering?
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11. What type of weathering is frost wedging?
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12. How is weathering different from erosion and deposition?
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13. What is the most common agent of erosion in the desert?
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14. What is the agent of erosion responsible for slump and creep?
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15. How could the removal of trees and other vegetation impact an environment?
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16. Which is most likely a prevention strategy for flooding?
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17. Which agent of erosion leads to the formation of sand dunes?
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18. How can water be an agent for physical weathering?
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19. Which of the following could increase the rate of chemical weathering of a rock?
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20. Why are wind, water, and gravity major agents of erosion rather than weathering?
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21. How are landforms made by deposition?
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22. How are mountains formed?
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7. Matching Type:
______.
______.
______.
A. divergent, tensional
B. convergent, compressional
C. transform, shear
Key:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
D.
A
C
D
D
B
B, A, C
B
A
WIND EROSION
A cobble is a clast of rock with a particle size of 6.4 centimetres (2.5 in) to 25.6 centimetres (10.1 in) based on
the Krumbein phi scale of sedimentology. Cobbles are generally considered to be larger than pebbles (4 to 64
millimetres diameter) and smaller than boulders (greater than 256 millimetres diameter). A rock made predominantly
of cobbles is termed a conglomerate.
pAR
Beach cobbles at Nash Point, South Wales, PARTIALLY ROUNDED ROCKS
https://en.wikipedia.org/wiki/Cobble_(geology)
https://biondoscience.wikispaces.com/7th+Grade+Unit+4+-+Weathering+%26+Erosion
Glaciers Unless they have lived overseas or experienced severe frost in the inland, few of our students are familiar with
the weathering effects of ice or have seen a glacier and the rock “milk” flowing from its maw. However our land surface
was sculpted by the action of immense glaciers in Permo-Carboniferous (299Ma) times when the continent moved
slowly across the South Pole to its present position. Displaced boulders carried by the ice can be seen in Coal seam
National Park and great scratch marks, or striae, they cut into the underlying granites remain. The southern part of our
state was affected again by the more recent (25ka) Pleistocene glaciation. It is likely that the south west of WA was
covered in ice to a depth of five km. More recent glaciations were less extensive than earlier Permian ones. The party
trick of lifting a needle using water can be performed when frozen water, an ice cube, is firmly pressed onto the needle.
Pressure causes the ice to temporarily thaw then refreeze round the needle. A similar process allows glaciers to pick up
deep scratches or striations
loose rocks and then use them to cause
on the land below. Geologists
have recognised these scratches on rocks in the Canning Basin. When the glacier melts rapidly, contained unsorted
debris is dumped in moraines. These can be seen south of the Stirling Ranges and are due to the most recent Ice Age.
These processes are still occurring in Australian Antarctic Territories today.
file:///C:/Users/rmangat/Downloads/Weathering_Erosion_Temperature_Water_-_Teacher_s_Notes.pdf