Lead is a toxic metal that can delay mental development in babies. The Environmental Protection Agency’s action level (that level where remedial action must be taken to clean the water) is 15 ppb. Does a 50 mL sample of water that contains 0.35 μg of lead fall above or below this action level?

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

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increased stability in the completion of fluorine's outer shell.