weathering

Question 1

what is the effect of weathering on rivers?

Answer 1

weathering breaks up the hillsides near the river’s source

Question 2

what is physical (freeze-thaw) weathering?

Answer 2

rocks breaks due to changes in temperature

1. water gets into cracks in rocks
2. when temperature falls below 0 degrees Celsius water will expand as it turns to ice
3. this expansion puts pressure on the rock and when fragments of the rock may break off

Question 3

what is biological weathering?

Answer 3

plants and burrowing animals break up the rock

plant’s growing roots puts force on the cracks

Question 4

what is chemical weathering?

Answer 4

weak acid in rainwater dissolves carbonate rocks such as limestone