Question

u4 - d1 (weathering, erosion and deposition)
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1 wind blows sand onto rocks and slowly breaks down the rock. this is an example of...
chemical weathering
mechanical weathering
erosion
deposition

2 over time, rock sediments form layers as a result of erosion. this is an example of...
chemical weathering
mechanical weathering
erosion
deposition

Explanation:

1. For question 1: Mechanical weathering is the physical breakdown of rocks without changing their chemical composition. Wind-blown sand abrading and breaking down rocks is a physical process, fitting mechanical weathering. Chemical weathering involves chemical changes, erosion is movement of broken material, and deposition is dropping eroded material.
2. For question 2: Deposition is the process where eroded sediments are laid down and form layers. Weathering is breaking down rocks, erosion is moving the broken material, so this matches deposition.

Answer:

1. B. Mechanical weathering
2. D. Deposition