Using the data in this table, calculate the number of half-lives that have passed for the dike (unit D on this table).





A) 1

B) 2

C) 3

D) 4

E) 5


A) 1

Environmental & Atmospheric Sciences

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The largest mass extinction in the Phanerozoic occurred in the ________

A) Miocene B) Permian C) Devonian D) Jurassic E) Cambrian

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Groundwater pollution can be reduced by introduction of microorganisms that may break down some of the wastes.

Answer the following statement true (T) or false (F)

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What will be an ideal response?

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