Which of the following is NOT a possible source of water contamination?
A. dry cleaners
B. farms
C. houses
D. rocks that have been mineralized by natural processes but not mined
E. All of these are possible sources of contamination.
Answer: E
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The introduction of exotic species into a freshwater ecosystem generally increases the population of the native species.
Answer the following statement true (T) or false (F)
Which of the following does not commonly occur when dark-colored mafic rocks weather?
A) Mafic minerals weather to clay minerals by hydrolysis. B) Iron-bearing minerals can oxidize to form the iron oxide mineral hematite. C) The abundant quartz in the rocks dissolves and forms silica-rich spring deposits. D) Some minerals weather at different rate than other minerals.
Summer sea ice in the Arctic Ocean may be gone by 2050.
Answer the following statement true (T) or false (F)
What function does the upper atmosphere ozone layer serve?
a) It protects against the sun’s harmful ultraviolet radiation. b) Its gases trap heat in the earth’s atmosphere leading to the greenhouse effect. c) This atmospheric layer provides a rich source of CFC used as a refrigerant to fuel air conditioning units. d) The ozone layer is the source of oxygen needed to breathe.