Question

Which process is defined as breaking down rocks into smaller pieces without changing the rocks' compositions?

erosion
oxidation
chemical weathering
mechanical weathering

Answer 1

Mechanical weathering is defined as breaking down rocks into smaller pieces without changing the rocks' compositions.

• It is also known as physical weathering which causes the crumbling of rocks.
• Mechanical weathering uses water or ice as an agent that leads to weathering of rocks and minerals.
• It is a mechanical process in which the water freezes, as the temperature lowers and causes the expansion of rocks.
• This process doesn't involve the formation of new substances.

Answer 2

Mechanical weathering is the process of breaking down rocks into smaller pieces without changing the rock's composition.

• Mechanical weathering is a physical process and hence also known as physical weathering.
• This is the main process contributing to soil formation.
• Since mechanical forces disintegrate the rocks, there is no change in the chemical composition of the rocks.
• It is the abrasion by wind, water, and ice that causes this weathering.
• Also, the roots of huge trees growing into the cracks of the rocks results in its weathering.
• Expansion and contraction due to changes in temperatures day and night cause weathering of the rocks.
• Processes like erosion, oxidation, and chemical weathering can alter the rock's composition.