Why does plutonium not occur in appreciable amounts in natural ore deposits?
A) Most naturally occurring plutonium deposits have already been depleted in the creation of nuclear weapons.
B) Plutonium is strictly a human-made element.
C) Any plutonium initially in the earth's crust has long since decayed.
D) Plutonium loses electrons to form positively charged particles that have long since washed into the oceans.
C
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Which overlay method preserves only those features that fall within the area extent common to the input and overlay layers?
A. Symmetrical difference B. Union C. Intersect D. Identity
The Colorado Plateau has been affected by Cordilleran orogenic events
Indicate whether the statement is true or false
Which term is used to describe the conversion of natural resources into goods and services in addition to the ongoing trade of such goods and services?
- Calculator - nongovernment organization - Ecosystem - Economy
Which industry releases the most toxic substances into the environment?
A. metal mining B. oil and gas C. chemical D. farming