A coral is a type of ________ that secretes ________ to form a hard external skeleton
A) algae; silica B) algae; calcium carbonate
C) polyp; calcium carbonate D) polyp; silica
C
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What is the consensus about clean coal among environmental analysts?
A. Burning coal will always produce CO2 and mining it is harmful. B. It is already a reality in other countries like Mexico. C. It is possible with better technology that will remove CO2 and allow us to mine coal without any impact. D. If enough money is devoted to it, it could be reality in the U.S. in ten years.
________________ stratus clouds are considered middle-level clouds
Fill in the blank(s) with correct word
An unconformity in which the strata on either side are essentially parallel is termed a(n) ________
Fill in the blank(s) with correct word
What primarily determines the intensity of solar radiation arriving at any spot on Earth?
A. apogee B. day length C. angle of incidence D. path length E. declination