The two most abundant elements in Earth's crust are
A. quartz and feldspar.
B. silicon and oxygen.
C. oxygen and aluminum.
D. silicates and carbonates.
Answer: B
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A chimpanzee on a space walk tosses his hat away. Both the chimp and his hat will move
A. a short distance and then gain speed. B. away from each other, but at different speeds. C. away from each other at the same speed. D. a short distance and then slow down.
Instructions: Choose one answer from each pair of selections. Does accretion (riming) occur during the ICE CRYSTAL process or the COLLISION COALESCENCE process?
According to the 2013 Fifth Assessment Report of the IPCC, the primary source of the increased atmospheric concentration of carbon dioxide since the pre-industrial period results from ____________________ use, with land-use change providing another significant but smaller contribution
Fill in the blank with correct word.
What is the significance of the National Environmental Policy Act?
What will be an ideal response?