Ultimately, all biofuels are ________, because they are the result of ________
A) synthetic; chemical manipulation of hydrocarbons
B) solar; photosynthesis
C) polymers; biological metabolic processes
D) geological; sedimentation
E) inefficient; decomposition by microorganisms
B
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Which of the following is the name for an abrupt change in wind speed or wind direction?
A. an air pocket B. squall C. wind shear D. flurry
Which of the following locations experiences the largest continuous belt of strong low pressure?
A) A
B) B
C) C
D) D
What do all volatile organic compounds have in common?
A. All are gases in the atmosphere. B. All are produced synthetically. C. All are emitted from processing and/or burning fossil fuels. D. All are greenhouse gases. E. All are naturally occurring colorless and odorless gases found in rocks and vegetation.
Which of the following best describes the role of biological activity in soils development?
A) Broadleaf trees tend to increase the alkalinity of soil, whereas needleleaf trees increase the acidity. B) Earthworms increase soil porosity and contribute to soil movement and organic content. C) Plant roots provide channels for air and water movement in soils. D) All organisms living in, on, and over the soil, influence soil development and characteristics: they can influence the pH, the organic matter, chemical content, and biological content of soils.