Weathering and Erosion Review

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What is mechanical weathering?

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Mechanical weathering is the physical breakdown of rocks into smaller pieces without changing their chemical composition. It can be caused by processes such as freeze-thaw cycles, abrasion, and biological activity.

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NGSS.MS-ESS2-2

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What is chemical weathering?

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Chemical weathering involves the breakdown of rocks through chemical changes, resulting in the formation of new minerals or substances. An example is the reaction of minerals with water or acids, such as acid rain.

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NGSS.MS-PS1-2

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What is the role of plants and animals in weathering?

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Plants and animals contribute to mechanical weathering through processes like root expansion and burrowing, which can break apart rocks.

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What is the difference between mechanical and chemical weathering?

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Mechanical weathering physically breaks rocks into smaller pieces without altering their composition, while chemical weathering changes the minerals within the rocks through chemical reactions.

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What is an example of mechanical weathering caused by temperature changes?

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An example is freeze-thaw weathering, where water seeps into cracks in rocks, freezes, expands, and eventually causes the rock to break apart.

Tags

NGSS.MS-ESS2-2

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What is acid rain and how does it affect weathering?

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Acid rain is precipitation that contains high levels of sulfuric and nitric acids, which can accelerate chemical weathering by reacting with minerals in rocks, leading to their decomposition.

Tags

NGSS.MS-ESS2-2

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What is the impact of glaciers on weathering?

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Glaciers cause weathering through mechanical processes like abrasion, where the movement of ice grinds down rocks, and through chemical processes as they melt and interact with minerals.

Tags

NGSS.MS-ESS2-2

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What is the significance of sunlight in weathering processes?

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Sunlight itself does not cause weathering; however, it can contribute to temperature changes that may lead to mechanical weathering.

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What is the process of hydrolysis in weathering?

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Hydrolysis is a chemical weathering process where minerals react with water, leading to the breakdown of the mineral structure and the formation of new minerals.

Tags

NGSS.HS-ESS2-5

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What is the role of gravity in erosion?

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Gravity drives erosion by pulling materials downhill, leading to processes such as landslides and the movement of sediment in rivers.