What does the term half-life describe?
A. time needed for half of the radioactive atoms in a substance to convert into energy.
B. half the time needed for a radioactive substance to become safe.
C. time needed for half the cells in an organism to turn cancerous from radiation damage.
D. half the time needed for cells in a living organism to recover from radiation damage.
E. time needed for half of the radioactive atoms in a substance to decay into stable isotopes.
Answer: E
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a. 50 meters b. 100 meters c. 150 meters d. 590 meters e. 1000 meters
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The polar cell
A. has low pressure centered over land in the northern hemisphere. B. has high pressure centered over land in the southern hemisphere. C. has surface winds out of the west, easterly winds aloft. D. has low pressure centered over the poles resulting in stormy conditions.
Explain how peridotite can melt at a divergent plate boundary without an increase in temperature
What will be an ideal response?