An aerial burst occurred in the Tunguska River valley of ________ in 1908
Fill in the blank(s) with correct word
Siberia
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What have humans done to maintain high crop yields?
A. They have developed synthetic versions of nutrients to help crops grow. B. They have learned how to extract phosphorus from the air. C. They have made synthetic inorganic fertilizers out of crude oil. D. They have generated enough organic fertilizer to feed all the crops.
The half-life of carbon-14 is 5,730 years. A sample is found to have one-eighth the original amount of carbon-14 in it. How old is the sample?
A. 4,580 years B. 5,730 years C. 17,200 years D. 716 years E. none of the above
The very common mineral shown in this photograph is commonly a pink- to cream-colored mineral with wavy, light-colored lines. What mineral is it?
A. quartz B. muscovite C. garnet D. biotite E. feldspar
The origin of the Earth's biological diversity is embodied in
A) ecological succession principle. B) limiting factor. C) the theory of evolution. D) competitive exclusion principle. E) the life zone concept.