Which greenhouse gas is found in great quantities in permafrost soils?
A. Nitrous oxide
B. Ozone
C. Methane
D. Carbon dioxide
Answer: C
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Less than 1 percent of the world's fresh water is available for human use, usually 'stored' in lakes, rivers, streams, groundwater and aquifers or as atmospheric water vapor.
a. true b. false
An ecosystem is best described as
A) a system that is composed of nonliving or inorganic matter. B) a system composed of living organisms. C) a group of living organisms and the abiotic spheres with which they interact. D) all living organisms in the atmosphere, hydrosphere, and lithosphere. E) a group of living plants and the soil types that is present.
In the carbon cycle, atmospheric carbon dioxide is incorporated into carbohydrates in plant tissues through photosynthesis
Indicate whether the statement is true or false.
Excluding Australia and New Zealand, the average island country has about _______ square miles of land
a. 600 b. 10 c. 100 d. 1,000 e. 10,000