When we burn fossil fuels, ________
A) the greatest environmental impact is the impact on the ozone layer
B) the greatest environmental impact is the local damage from extraction
C) the resulting carbonic acid leads to acid rain
D) the greatest environmental impact is increased greenhouse gases
E) we liberate carbon back into the carbon cycle, increasing the amount available for plant growth
D
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Ice beneath the blades of ices skates is slippery due to
A. solid ice pressurized into liquid water. B. empty spaces in ice crystals being crushed. C. added pressure on the ice surface. D. all of the above
What is the principle of superposition?
The movement of water in a wave travels
A) with the wave. B) in a circular path at and just below the water surface. C) in a circular path at a depth of one-half the wavelength. D) in both a longitudinal and circular path.
Which statement is least associated with biological evolution through natural selection?
A. evolution by natural selection is not important because it is just a theory B. evolution explains the origin of life C. humans, apes, and monkeys evolved from a common ancestor D. evolution by natural selection is part of a grand plan E. survival of the fittest means survival of the strongest