Keeling's reports from Mauna Loa demonstrated ________
A) that as distances from cities decreased, CO2 concentrations increased
B) that CO2 levels have been stable over the last 40 years
C) that sediments deposited on the seafloor can yield clues about past climates
D) the presence of El Niño
E) an increase in tropospheric CO2 from the 1950s to present
Answer: E
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A gas threatening Earth's ozone layer is
A) sulfur dioxides. B) chlorofluorocarbons. C) the greenhouse effect. D) photochemical smog. E) nitrous oxide.
If the ozone in the atmosphere were to be destroyed, which of the following effects would you most expect to occur?
a. The thermal structure of the atmosphere would remain the same. b. More shortwave radiation would penetrate the atmosphere. c. There would be a decrease in the receipt of ultraviolet radiation at the surface. d. More longwave radiation would penetrate the atmosphere.
Valleys that lead from the continental shelf into deeper waters are known as ________
Fill in the blank(s) with correct word
Productivity is the amount of carbon fixed by organisms through the synthesis of organic matter using energy derived from ________ and ________
A) hydrothermal, available nutrients B) chemosynthesis, hydrothermal C) chemosynthesis, photosynthesis D) photosynthesis, hydrothermal E) none of these