What causes a decrease in oxygen levels beyond the sunlit layer?
a. There are fewer animals present
b. Mineral precipitation
c. The respiration of marine animals and bacteria
d. Decreased saturation because of cooler water
e. The by-products of photosynthesis
c
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Deposits of sand and gravel that contain gold particles large enough to be recovered by panning are called ____
a. the mother lode b. strikes c. placer deposits d. prospective deposits e. gold domes
?The per capita ecological footprint in the United States is lower than the global average.
Answer the following statement true (T) or false (F)
European exploration decimated the Pacific islanders and disrupted their culture in numerous ways.What did the explorers seek to gain from the islands, and what negative impacts did they introduce?
Achieving "zero pollutant discharge" in water, as stipulated by some laws is in practice difficult because
A. many analytical instruments are incapable of detecting substances present at very low, but nonzero, concentrations. B. treatment costs escalate exponentially as pure water is approached. C. no water-treatment process is completely efficient at removing pollutants. D. All of the choices are correct.