The two main gases making up the lower atmosphere are
A. Oxygen and methane
B. Carbon dioxide and nitrous oxide
C. Helium and hydrogen
D. Oxygen and carbon dioxide
E. Nitrogen and oxygen
Answer: E
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Which of the following is an effect of high selenium concentrations in stream water?
A) Selenium mining companies will want to extract the selenium and thus damage the aquatic ecosystem. B) Selenium causes birth defects in fish. C) The selenium will react with potassium isocyanate, resulting in cyanide poisoning of organisms living in the stream. D) There are no negative effects from selenium, but high selenium levels generally indicate high levels of substances that are harmful. E) Selenium reacts with oxygen, thus suffocating fish and other aquatic organisms.
A hydrograph is a plot of ________.
A. sediment load versus time B. rainfall versus the drainage area C. the volume of water or stream-surface height versus time D. water quality versus time E. stream elevation versus distance downstream
Many synthetic organic chemicals are concentrated in the fat of carnivores because
A) the chemicals are non-biodegradable or persistent and highly soluble in lipids. B) the chemicals are highly soluble in water. C) these animals eliminate toxins from the body by storing them in fat. D) fat is able to break down toxins more effectively than the liver.
Earth's primitive atmosphere evolved from gases ________
A) from the Sun B) collected from the nebula C) produced by radioactive decay D) expelled from within the earth E) escaping from water