Shadow zones confirmed the presence of Earth's core
a. True
b. False
True
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Elements above uranium in the periodic table do not exist in any appreciable amounts in nature because they have short half-lives. Yet, there are several elements below uranium in atomic number with equally short half-lives that do exist in appreciable amounts in nature. How can you account for this?
A. These are isotopes formed by living bodies. B. These isotopes result from the radioactive decay of uranium. C. These isotopes were placed in nature by the testing of nuclear bombs. D. These isotopes were formed from the fusion of even smaller isotopes.
Despite the independence of India, Rwanda and Algeria, the continuing effects of colonialism are still seen in
A) English as the official language or lingua franca. B) their incorporation into the world system core. C) violent conflicts involving territory and power. D) the large secondary (manufacturing) sector of the economy. E) the loss of all cultural identity.
The force driving plate tectonics is ________
A) heat in the deepest layers of the earth B) freezing and thawing of water in the earth's crust C) gravity D) solar radiation E) nuclear reactions in magma
Which of the following best matches the description?Use of a stream's water flow for such purposes as hydroelectric power.
A. in-stream uses B. nonpoint source C. groundwater mining D. water diversion E. aquifer F. landfills G. artesian aquifer H. water table I. unconfined aquifer J. septic tank K. aquitard L. point source M. confined aquifer N. aquiclude O. surface impoundment