Weathering, Erosion, Deposition, & Soil

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What is mechanical weathering?

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Mechanical weathering is the process of breaking down rocks into smaller pieces without changing their chemical composition. An example is when animals burrow into the ground, breaking up the soil.

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What is chemical weathering?

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Chemical weathering involves the chemical alteration of minerals in rocks, often due to reactions with water, acids, or gases. This process can change the composition of the rock.

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What is erosion?

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Erosion is the process by which soil and rock are removed from one location and transported to another, often by wind, water, or ice.

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What is deposition?

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Deposition is the process where materials transported by erosion are dropped or settled in a new location, such as sand being deposited on a beach by waves.

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What is humus?

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Humus is the dark, organic material in soil formed from the decay of plant and animal matter, which enriches the soil and helps retain moisture.

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How do roots contribute to mechanical weathering?

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Roots can grow into cracks in rocks and as they expand, they pry the rocks apart, contributing to mechanical weathering.

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What role does water play in weathering?

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Water can cause both mechanical and chemical weathering. It can freeze in cracks, expanding and breaking rocks apart, or it can dissolve minerals, altering the rock's composition.

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What is abrasion in the context of erosion?

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Abrasion is the process of wearing down surfaces through friction, often caused by particles carried by wind or water striking against rocks.

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What is the difference between weathering and erosion?

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Weathering is the breakdown of rocks in place, while erosion involves the movement of those broken materials from one location to another.

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What is exfoliation?

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Exfoliation is a type of mechanical weathering where layers of rock peel away due to temperature changes causing expansion and contraction.