What kind of rocks result when rocks eroded from higher elevations (mountains, hills, plains) accumulate at lower elevations (such as swamps and ocean bottoms)?
A) metamorphic
B) sedimentary
C) igneous
D) sima
Answer: B
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Why might the following nuclear reaction not be very good for energy production in a fission reactor?
U ? 
Th + 
He + 3 neutrons
A. Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei. B. The material only produces a few neutrons so the chain reaction will not be very efficient. C. The mass of the by-products is too high, and therefore, the energy released will not be large enough. D. The reactants are too small to obtain much energy from the missing mass due to the strong nuclear force. E. The products are not the right size to obtain much energy from missing mass due to strong nuclear force.
An increase in the number of people living in the area included in the Investigation would most directly threaten the sustainability of
A) the local drinking water supply. B) the type of bedrock. C) the temperature of the global ocean. D) regional atmospheric circulation.
As of 2009, the Persian Gulf region was believed to contain _______ percent of the world's oil reserves.
A. 50 B. 68 C. 75 D. 92
Present-day hominids arose from the ____________________ and ____________________ groups. Fill in the blank(s) with the appropriate word(s)