Lab 5 Assignment (1)
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Georgia State University *
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1113L
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Geography
Date
Apr 3, 2024
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docx
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8
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ab 5: Weathering GEOG 1113L – Introduction to Landforms Lab
Name: _____Joel Limb________
I.
What is Weathering?
1.
What does weathering create/provide and what would Earth’s surface be composed of if weathering did not happen?
-
Weathering breaks down the rocks and creates fragmented materials or sediments which become the raw material for other rocks and for the formation of soils. It is the principal source of inorganic material in the solid, which vegetations need to grow. If it weren't for weathering the Earth's continental surface would just be solid bedrock.
2.
What is the difference between weathering and erosion?
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Weathering is prepping the rock materials to be moved and erosion is when the rock gets moved.
3.
Describe the process of frost wedging (frost action).
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When water turns into ice it increases in volume by 9%. Water that has been absorbed into the pores within the rock expands when it freezes, building up stress and causing the rock to break.
4.
Similar to frost wedging, __salt crystal growth_______ fractures rocks through crystal growth within the pores of the rock. These crystals originate from ___water____ inside the rock that later evaporates and leaves behind __salt crystals_____.
5.
The two previously mentioned types of weathering are both forms of what?
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Mechanical and physical weathering.
6.
Which type of weathering causes metal to rust?
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Chemical weathering causes metal to rust. Rust is a form of iron oxide that forms when iron reacts with oxygen in the presence of water. This reaction is called oxidation.
7.
Weathering that alters minerals in a rock via water, oxygen, carbon, and/or other organic acids is called what?
-
Chemical weathering
8.
Which type of weathering causes karst topography?
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Chemical weathering
9.
Name three features you might find in a karst landscape.
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Streams on the surface get diverted underground through openings in the rocks created by carbonation. -
There can be steep sided gorges pitted with cavities called sinkholes which can often collapse catastrophically.
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Caves are formed when carbonic acid dissolves soluble rocks, such as limestone, marble, and
gypsum. Caves can be small or large, and they can be simple or complex.
10.
What is one fact (from the video) about caves that you find interesting?
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The part that talks about the possibility of seeing sediments from glaciers mixed with bones of dead animals or even humans and artifacts from the bronze or iron ages.
11.
Tree roots, lichen, and humans all play a part in weathering as well. Which type of weathering is this called?
-
Biological weathering
II.
Weathering Resistance
Use the two images below to answer questions about weathering resistance. Assume all rock layers in both images have been subjected to the same type/amount of weathering.
Image A:
1.
Which color/pattern represents a rock layer that is MOST resistant to weathering compared to the others?
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The dark grey color is most resistant to weathering.
2.
Which color/pattern represents a rock layer that is LEAST resistant to weathering compared to the others?
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The black color is least resistant to weathering.
3.
Which colors/patterns represent rock layers that share the same level of resistance to weathering compared to the others?
-
The grey color and light grey because they have similar patterns.
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