Explain how "soft" plants like lichens can cause biological weathering
What will be an ideal response?
Answer: Lichens live on bare rock and draw minerals from rock via ion exchange, thus weakening the rock. Also, alternate wetting and drying causes expansion and contraction of the fungi and algae enough to knock small flakes off rocks.
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A boulder 50 times heavier than a pebble doesn't fall faster when both are dropped because
A. air resistance during fall is negligible. B. experiments show both accelerate equally. C. gravity acts equally on both the pebble and the boulder. D. it has 50 times greater mass.
The Permian mass extinction event was most likely caused by enormous volcanic (trap) eruptions.
A. True B. False
Which relative dating principle(s) can be observed in the Grand Canyon?
A. Cross cutting B. Original horizontality C. Superposition D. All are correct
The U.S. has about ________ of its labor force engaged in services employment
A) 25% B) 45% C) 50% D) 60% E) 80%