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NREM 301 Exam 1 Questions and Answers Graded A+ What is the difference between physical and chemical weathering? Physical weathering breaks down rocks into smaller pieces without changing their chemical composition, while chemical weathering involves changes to the minerals in the rock due ...

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  • November 11, 2024
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  • 2024/2025
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NREM 301 Exam 1 Questions and
Answers Graded A+
What is the difference between physical and chemical weathering?


✔✔Physical weathering breaks down rocks into smaller pieces without changing their chemical

composition, while chemical weathering involves changes to the minerals in the rock due to

reactions with water, air, or other chemicals.




How does frost wedging contribute to physical weathering?


✔✔Frost wedging occurs when water enters cracks in rocks, freezes, expands, and breaks the

rock apart over time.




What role does water play in chemical weathering?


✔✔Water acts as a solvent, facilitating chemical reactions that break down minerals and alter

rock composition.




Why are sedimentary rocks more susceptible to weathering?


✔✔Sedimentary rocks are often softer and more porous, making them more prone to both

physical and chemical weathering.




1

,How does biological activity influence weathering?


✔✔Plants, animals, and microorganisms can break down rocks by physical pressure or by

releasing acidic substances that contribute to chemical weathering.




What is the main cause of soil formation?


✔✔Soil formation is primarily driven by the weathering of rocks over long periods, combined

with organic matter accumulation.




How does acid rain accelerate the weathering process?


✔✔Acid rain increases chemical weathering by reacting with minerals in rocks, particularly

those containing calcium carbonate.




Why is weathering important for the Earth’s systems?


✔✔Weathering breaks down rocks into soil, which is crucial for plant growth and the cycling of

nutrients in ecosystems.




What is the difference between weathering and erosion?


✔✔Weathering is the process of breaking down rocks, while erosion involves the movement of

weathered materials by wind, water, or ice.

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, How do temperature changes contribute to weathering?


✔✔Frequent temperature fluctuations cause rocks to expand and contract, eventually leading to

cracks and fragmentation.




What is exfoliation in the context of weathering?


✔✔Exfoliation is the process where layers of rock peel away due to pressure release or

temperature changes.




How do lichens contribute to rock weathering?


✔✔Lichens produce acids that slowly break down the surface of rocks, contributing to chemical

weathering.




What type of weathering is most common in tropical climates?


✔✔Chemical weathering is more common in tropical climates due to high temperatures and

abundant rainfall.




Why do igneous rocks typically weather more slowly than sedimentary rocks?


✔✔Igneous rocks are usually harder and more resistant due to their crystalline structure.

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