In a temperature inversion
A. warm air overlies cold air
B. cold air overlies warm air
C. clouds cover the ground
D. fog forms
A. warm air overlies cold air
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As Earth revolves around the sun, the Northern Hemisphere is tilted: a. straight up and down at all times of year
b. toward the sun in March but away from it in September. c. toward the sun in December but away from it in June. d. toward the sun in June but away from it in December.
What is the main obstacle to extracting rare-earth metals from a deposit?
A. They are typically found at low concentrations in the host rock. B. They are equally distributed around the world. C. There is a lack of technological understanding about how to extract them. D. There is no demand for them on the world market.
Minerals are composed of
A) silicon compounds. B) common types of rocks. C) elements joined as compounds. D) homogeneous solids.
What research vessel carried out the first large-scale plankton study?
A) Meteor B) HMS Challenger C) HMS Beagle D) HMS Discovery