Question

A student is studying a rock formation. Which two questions could the student answer to determine if the rocks underwent chemical weathering?


Do the rocks have cracks where plants are growing from?


Do the rocks have cracks where water can freeze and thaw?


Do the rocks have small holes all over their surface?


Do the rocks have reddish-brown spots?


Do the rocks experience extreme heating and cooling?

Answer 1

- Do the rocks have small holes all over their surface? (Yes → possible chemical dissolution.)
- Do the rocks have reddish-brown spots? (Yes → oxidation/rusting, a chemical change.)