What is mechanical weathering also known as?

• Physical weathering

• Chemical weathering

• Biological weathering

• Thermal weathering

Which of the following is a process of chemical weathering?

• Freeze-thaw cycles

• Oxidation

• Tree roots growing into rock cracks

• Animals burrowing into rock crevices

What role do lichens play in weathering?

• They produce weak acids that dissolve rock surfaces

• They physically break rocks apart

• They cause freeze-thaw cycles

• They oxidize iron in rocks

How does acid rain affect limestone?

• It rapidly weathers limestone

• It causes limestone to expand and contract

• It physically breaks limestone apart

• It has no effect on limestone

What is the impact of human activities on weathering processes?

• They can significantly accelerate weathering

• They have no impact on weathering

• They only affect mechanical weathering

• They only affect biological weathering