Asked by dev
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 cracks where plants are growing from?
Do the rocks have cracks where water can freeze and thaw?
Do the rocks experience extreme heating and cooling?
Do the rocks have small holes all over their s
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Answers:
- Do the rocks have reddish-brown spots?
- Do the rocks have small holes all over their surface?
Why: Reddish-brown spots indicate oxidation (iron in the rock has chemically reacted with oxygen). Small holes or pitting usually result from chemical dissolution or other chemical reactions removing mineral material. The other options (plants in cracks, freeze–thaw, extreme heating/cooling) are forms of physical/mechanical weathering.
- Do the rocks have reddish-brown spots?
- Do the rocks have small holes all over their surface?
Why: Reddish-brown spots indicate oxidation (iron in the rock has chemically reacted with oxygen). Small holes or pitting usually result from chemical dissolution or other chemical reactions removing mineral material. The other options (plants in cracks, freeze–thaw, extreme heating/cooling) are forms of physical/mechanical weathering.
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