The plastic limit indicates the point at which the soil changes from:
a. a liquid to a plastic state
b. a liquid to a semi-solid state
c. a plastic to a semi-solid state
d. a plastic to a liquid state
c
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The term chronic malnutrition refers to people who
A. eat less than the basic minimum number of daily calories. B. eat balanced meals. C. eat too much. D. do not eat enough proteins and key nutrients. E. eat too much protein.
What is ozone?
A. a gas that blocks ultraviolet radiation from reaching Earth B. a gas that resides in the stratosphere C. a gas consisting of molecules containing three oxygen atoms D. all of the above
Approximately 40% of the world's population lives in or near an ocean coast
Indicate whether the statement is true or false
By weight percent, the most common chemical element in the whole earth is
A. calcium. B. magnesium. C. iron. D. aluminum.