A sample contains 60 % Plagioclase Feldspar and a medium amount of silica. What would you call it?
A) an intermediate igneous rock
B) a mafic igneous rock
C) an ultramafic igneous rock
D) a felsic igneous rock
Answer: A
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A. cold ocean currents. B. rain shadow. C. distance to the sun. D. distance to ocean.
Which was found to be the most economical approach to protect drinking water sources for New York City?
A. Pay landowners to protect watersheds. B. Build a water purification plant. C. Pump oxygen into lakes. D. Spraying herbicides in lakes.
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A) 90 B) 75 C) 60 D) 50 E) 35
What role do condensation nuclei play in the formation of clouds?
What will be an ideal response?