Lab 5 Assignment_Online

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Georgia State University *

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Geography

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Feb 20, 2024

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Lab 5: Weathering GEOG 1113L – Introduction to Landforms Lab 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 provides inorganic material in the soil which vegetation needs to grow. If it wasn’t for weathering the Earth’s continental surface would just be solid bedrock. 2. What is the difference between weathering and erosion? Weathering preps the rock materials to be moved and Erosion is when the rock gets moved. 3. Describe the process of frost wedging (frost action). When water turns into ice, it increases in volume by 9% which is how water pipes burst when it gets cold. Frost actions can break off anything from small grains to large boulders and is an important process in cold environments where freeze-thaw cycles are common. 4. Similar to frost wedging, Salt Wedging fractures rocks through crystal growth within the pores of the rock. These crystals originate from Salt Crystals inside the rock that later evaporates and leaves behind Chemical precipitate. 5. The two previously mentioned types of weathering are both forms of what? Frost action and Salt Crystal Growth. Mechanical Weathering 6. Which type of weathering causes metal to rust? 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? Chemical Weathering 9. Name three features you might find in a karst landscape. Sinkholes, Caves, and Springs 10. What is one fact (from the video) about caves that you find interesting? The Stalactites 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? Dark Gray 2. Which color/pattern represents a rock layer that is LEAST resistant to weathering compared to the others? Black 3. Which colors/patterns represent rock layers that share the same level of resistance to weathering compared to the others? The gray 4 th and 5 th .
Image B: 4. Within the red box, which layer appears to be most resistant to weathering (A, B, or C)? C 5. Within the red box, which layer appears to be the least resistant to weathering? B 6. What is one indication that a rock layer is more resistant to weathering? A
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