Do now! Can you continue the questions on pages 84 and 85?
Dec 14, 2015
Chemical weatheringRain is slightly acidic as it contains substances dissolved from the air. It can react with rock, dissolving it.
Physical weathering
When rocks are hot they expand, and when they cool they contract. Repeated changes cause the rock to crack, often causing rock to peel off.
Sometimes called “onion-skin weathering”
Physical weathering
Freeze-thaw weathering is another example
You now know all about freeze-thaw weathering
Transport
Rock falls to the bottom of rock faces and may be transported away by fast moving streams.
Deposit
Smaller rock fragments are carried further than large ones, eventually being deposited on the bottom in slow water.
What is soil?
A mixture of stones, smaller rock particles (sand) and humus (remains of dead plants and animals)