Before the Industrial Revolution, the most important source of fuel was
A) biomass.
B) coal.
C) natural gas.
D) petroleum.
E) alcohol.
Answer: A
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A 10-N falling object encounters 10 N of air resistance. The net force on the object is
A) 0 N. B) 4 N. C) 6 N. D) 10 N. E) none of the above
The symbiotic dinoflagellates that live in the tissues of coral polyps ____.?
A) ?provide carbon dioxide and phosphates for the polyps B) ?feed on the tissues of the polyps and are dangerous parasites C) ?are the main cause of coral bleaching, and are threatening the reefs of the world D) ?provide additional nourishment and oxygen to the polyps through photosynthesi
A soil deficient in humus would ________
A) have unusually low levels of biological activity B) have many decomposers and be able to hold considerable moisture C) have no cations D) have a very low mineral content E) have a large amount of vegetative detritus at the surface
Recently, geologists have been analyzing ________ generated by tidal friction, ocean waves, and storms to gain an even more detailed image of the crust and upper mantle.
A. ocean currents B. water movement C. light sources D. evaporation E. energy waves