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
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Households and workplaces produce five major types of recyclable materials. What are these materials?
What will be an ideal response?
Based on recent U.S. census data, what shape in an age-structure chart would best illustrate the effects of the baby-boom in the United States?
A. classic pyramid B. wide base that narrows rapidly C. narrow base and wide top D. stable base with a slight bulge near the top E. stable base with a slight bulge near the bottom
The largest mass extinction in the Phanerozoic occurred in the ________
A) Miocene B) Permian C) Devonian D) Jurassic E) Cambrian
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)