How much heat energy is needed to melt 1 gram of ice?
-8 calories of heat energy
-80 calories of heat energy
-800 calories of heat energy
-8000 calories of heat energy
-80 calories of heat energy
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The most common meat found in the diet of Central Asian pastoralists is
A) chicken B) beef C) mutton D) fish E) pork
A likely cause for the existence of Earth's magnetic field is
A) moving charges in the liquid part of Earth's core. B) great numbers of very slow moving charges in the Earth. C) convection currents in the liquid part of Earth's core. D) all of the above E) none of the above
Which of the following is a benefit of using nuclear power?
A) The increasing costs of nonrenewable energy sources make nuclear energy more economically viable. B) Core meltdown of reactors can provide "bonus" energy for electricity production. C) Few greenhouse gases are emitted. D) Using nuclear power requires greater use of fossil fuels. E) Mining activities enhance ecosystems.
What is the substance that gives soil a blackish to brownish appearance?
A. Iron oxide B. Salts C. Clay minerals D. Organic matter