Agriculture is the most widespread primary economic activity.
Answer the following statement true (T) or false (F)
True
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A polymorph can be defined as
A. minerals that have the same chemical formula and crystal structure, but exhibit different physical properties. B. a set of silicate minerals. C. minerals that have the same chemical formula, but different crystal structures. D. minerals that have the same crystal structure, but different chemical formulas.
How much of the world's food is produced on irrigated land?
A. almost half B. less than 10% C. almost all D. none
Hydraulic fracturing (fracking) is
A) the use of cold fusion to produce nuclear power. B) an experimental technique for extracting oil from the ocean floor. C) a new technique of producing power using water. D) a technique which forces oil and gas out of shale rock. E) a long-established technique of drilling for water that dates back centuries
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.