________ sediments are deposited or precipitated as a result of the actions of organisms.
A. Pyroclastic
B. Siliciclastic
C. Calciclastic
D. Hyaloclastic
E. Biochemical
Answer: E
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The frequency of electromagnetic waves and the frequency of the vibrating electrons that produce them are normally
A. inversely proportional. B. the same. C. quite different. D. nearly the same.
Which of the following is a benefit of using nuclear power?
A) Core meltdown of reactors can provide "bonus" energy for electricity production. B) The increasing costs of nonrenewable energy sources make nuclear energy more economically viable. C) Mining activities enhance ecosystems. D) Using nuclear power causes more use of fossil fuels. E) Few greenhouse gases are emitted.
While the troposphere is 11 miles thick above sea level at the tropics, it is only four miles thick above the North and South Poles.
Answer the following statement true (T) or false (F)
It has been estimated that about ________ of the CO2 added to the atmosphere has been absorbed by seawater.
A. 5% B. 25% C. 40% D. 15%