A clast of granite found in a breccia is dated at 450 million years old. What can you conclude about the breccia?
a. The breccia is older than 450 million years.
b. The breccia is younger than 450 million years old.
c. The breccia was metamorphosed more than 450 million years ago.
d. The breccia was metamorphosed fewer than 450 million years ago.
e. You can’t draw any conclusions
b
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Currently, spent fuel rods used to power nuclear reactors are
A. stored outside of the reactor in water-filled pools and years later, in dry casks. B. sent to a national repository. C. placed in metal drums and dumped deep in the ocean. D. loaded into rockets and shot into space. E. treated chemically to speed up the progression of half lives.
Which of the following is NOT a valid explanation of the urban heat island effect?
A) Pollution trapped over a city enhances the greenhouse effect of the atmosphere. B) Urban areas generally have a higher albedo than surrounding rural areas. C) Urban areas retain heat longer and do not cool off as quickly at night as surrounding rural areas. D) Increased runoff on urban surfaces reduces evaporative cooling in the area.
Continental collision may form rift valleys
a. True b. False Indicate whether the statement is true or false
A melting glacier creates a river that separates a population of squirrels. Resources, predators, and other ____________ vary slightly between the two sides of the river.
a. selective forces b. more c. allopatric speciation d. microevolutionary events e. communicate f. interbreed g. less h. gene pool i. symmetric speciation j. macroevolutionary events