The EPA limit for lead in the soil of play areas is 400 ppm. This is the same as
A) 400 mg lead in each gram of soil.
B) 400 g lead in each kilogram of soil.
C) 400 mg lead in each kilogram of soil.
D) 400 µg lead in each kilogram of soil.
E) 400 µg lead in each milligram of soil.
Correct Answer:
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