The two main sources of early immigrants to the American colonies and the newly independent United States were the United Kingdom and Africa
Indicate whether the statement is true or false.
Answer: TRUE
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Acidic soils tend to be
A) agriculturally productive because the high concentration of cations in them causes them to attract nutrients with positive ions. B) agriculturally productive because the low concentration of cations in them causes them to attract nutrients with positive ions. C) agriculturally unproductive because the high concentration of cations in them causes them to leach away nutrients with positive ions. D) agriculturally unproductive because the low concentration of cations in them causes them to leach away nutrients with positive ions.
Lithification is a pressure-induced process
a. True b. False
Siberian Express is the term used when:
A) an mP air mass from the north Atlantic enters New England and generates snowfall. B) an unusually cold air mass enters the Rocky Mountains. C) a modified air mass originating in Siberia reaches the Pacific Northwest. D) an outbreak of bitterly cold air from Canada intrudes over a large part of the United States.
Most photosynthesis in the open ocean occurs in the ____.
A. abyssal zone B. euphotic zone C. estuary zone D. bathyal zone E. benthic zone