Question

earths processes: weathering and erosion unit review...
complete this assessment to review what youve learned. it will not count towar...
2 of 9

identify the circumstances associated with increased rates of physical weathering.
select the two correct answers. (1 point)

□ large, smooth exposed surfaces with no cracks

□ constant temperature

□ freeze - thaw cycles

□ hot and cold cycles

Explanation:

Physical weathering involves the breakdown of rocks without chemical changes. Freeze - thaw cycles occur when water enters cracks in rocks, freezes (expanding and widening the cracks), and then thaws. Hot and cold cycles cause rocks to expand (when hot) and contract (when cold), leading to stress and eventual breakdown. Large, smooth surfaces with no cracks offer less area for weathering agents to act on. Constant temperature does not provide the stress (from expansion - contraction) that is needed for increased physical weathering.

Answer:

freeze - thaw cycles, hot and cold cycles