Asked by yfg
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 reddish-brown spots?
Do the rocks have small holes all over their surface?
Do the rocks experience extreme heating and cooling?
Do the rocks have cracks where plants are growing from?
Do the rocks have cracks where water can freeze and thaw
All Answers 1
Answered by
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The two best questions are:
- Do the rocks have reddish-brown spots? — reddish-brown staining indicates oxidation (rust) of iron minerals, a common chemical weathering product.
- Do the rocks have small holes all over their surface? — pitting or solution cavities can result from chemical dissolution (e.g., acid or carbonic acid reacting with minerals).
The others (extreme heating/cooling, cracks with plant roots, cracks from freeze–thaw) point to mechanical/physical weathering.
- Do the rocks have reddish-brown spots? — reddish-brown staining indicates oxidation (rust) of iron minerals, a common chemical weathering product.
- Do the rocks have small holes all over their surface? — pitting or solution cavities can result from chemical dissolution (e.g., acid or carbonic acid reacting with minerals).
The others (extreme heating/cooling, cracks with plant roots, cracks from freeze–thaw) point to mechanical/physical weathering.
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