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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In the carbon cycle, atmospheric carbon dioxide is incorporated into carbohydrates in plant tissues through photosynthesis
Indicate whether the statement is true or 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.
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
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