A positively charged atom of an element is called a(n) ____
A)positron
B)neutron
C)ion
D)isotope
E)isomer
C
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What have humans done to maintain high crop yields?
A. They have developed synthetic versions of nutrients to help crops grow. B. They have learned how to extract phosphorus from the air. C. They have made synthetic inorganic fertilizers out of crude oil. D. They have generated enough organic fertilizer to feed all the crops.
Food shortages that lead to extensive starvation in a population are known as ________
Fill in the blank(s) with the appropriate word(s).
The advection of cold or warm air can occur at:
A) low levels. B) mid-levels. C) upper-levels. D) all of the above
A valley breeze has more in common with a katabatic wind than does a mountain breeze
Indicate whether the statement is true or false