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
You might also like to view...
Carbon, hydrogen, oxygen, and nitrogen make up approximately what percentage of most living organisms?
A. 25% B. 47% C. 82% D. 96% E. 100%
Matter is anything that
A. has mass and takes up space. B. has the capacity to do work. C. can be changed in form. D. can produce change. E. moves mass.
______ 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.
A. marble B. arkose C. shale D. graywacke E. quartz sandstone