You are handed a sample of an unknown silicate mineral. Which two elements must it contain?
A) silicon and oxygen
B) iron and silicon
C) carbon and hydrogen
D) silicon and sodium
Answer: A
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The soil with the highest cation exchange capacity will have
A) abundant organic matter and acidic conditions. B) abundant organic matter and alkaline conditions. C) little organic matter and acidic conditions. D) little organic matter and alkaline conditions.
Which of the following is one reason that snow is more common in winter than in summer?
a. Precipitation falling from a cloud as snow has a better chance of surviving when temperatures are cold. b. Very tall clouds are more common in winter than in summer. c. Cumulonimbus clouds rarely occur in winter. d. The atmosphere is usually more unstable in summer.
What did the Mars rover Opportunity discover on Mars that relates to questions about the existence of water on Mars?
A) The rover found sedimentary rocks that contained minerals that could only have formed by precipitation from water. B) The rover found no evidence of water ever having been on Mars. C) The rover found ice in the soil. D) The rover found liquid water emerging from a spring, freezing to ice.
The biomagnification of DDT demonstrates that
A. Water-soluble toxins are widespread B. Birds should not depend on fish for food C. DDT is easily metabolized and excreted by most organisms D. Higher trophic level organisms can concentrate toxins in a type of "inverse biological pyramid." E. DDT is an extremely water-soluble material