Why does plutonium not occur in appreciable amounts in natural ore deposits?
A. Any plutonium initially in the earth's crust has long since decayed.
B. Plutonium is strictly a human-made element.
C. Most naturally occurring plutonium deposits have already been depleted in the creation of nuclear weapons.
D. Plutonium loses electrons to form positively charged particles that have long since washed into the oceans.
Answer: A
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______ and nickel are thought to comprise significant portions of Earth's inner and outer cores.
a - aluminum b - quartz c - titanium d - basalt e - iron
A(n) ________ is sandstone containing a significant amount of feldspar.
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