Which of the following best describes the role of biological activity in soil development?
A) Plant roots provide channels for air and water movement in soils.
B) Broadleaf trees tend to increase the alkalinity of soil, whereas needleleaf trees increase the acidity.
C) Earthworms increase soil porosity and contribute to soil movement and organic content.
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.
D
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An apple weighs 1 N. The magnitude of net force on the apple when it is in free-fall is
A) 0 N. B) 0.1 N. C) 1 N. D) 10 N. E) none of the above
A general term referring to all biostratigraphic units such as range zones and concurrent rangezones:a
cast d. formation b. mold e. system c. biozone
The number of protons in an atom’s nucleus:a
orogeny d. nucleus b. atomic mass e. atomic number c. atom
As early migrants arrived in the US they generally learned English within a generation and assimilated into American society, giving rise to the idea of the US as a cultural "____________________."
-melting pot -Dream -mainstream society -norm -manifestation