Understanding Mechanical Weathering

What is the primary effect of weathering on rocks?

• It makes rocks larger.

• It makes rocks more dense.

• It changes the color of rocks.

• It breaks down rocks into smaller pieces.

Which type of weathering involves breaking rocks into smaller pieces without changing their composition?

• Thermal weathering

• Biological weathering

• Mechanical weathering

• Chemical weathering

How does mechanical weathering increase the surface area of rocks?

• By breaking the rocks into smaller pieces

• By melting the rocks

• By compressing the rocks

• By dissolving the rocks

What unique property of water contributes to frost wedging?

• Water becomes acidic when it freezes.

• Water expands when it freezes.

• Water contracts when it freezes.

• Water evaporates quickly.

In which climate is frost wedging most likely to occur?

• Temperate

• Tropical

• Desert

• Cold

What happens during salt crystal growth in rocks?

• Salt dissolves the rock.

• Salt crystals form and expand, causing cracks.

• Salt makes the rock more dense.

• Salt changes the color of the rock.

What is sheeting in the context of mechanical weathering?

• The melting of rock surfaces

• The growth of plants on rock surfaces

• The formation of salt layers on rocks

• The peeling off of rock layers due to pressure changes

How can plants contribute to mechanical weathering?

• By changing the color of rocks

• By growing roots that break rocks apart

• By providing shade to rocks

• By absorbing water from rocks

Which human activity is an example of biological weathering?

• Mining operations

• Fishing

• Building roads

• Planting trees

What role do animals play in biological weathering?

• They protect rocks from weathering.

• They dig and break down rocks.

• They polish rock surfaces.

• They prevent water from entering rocks.