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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How deep is the photic layer in typical coastal waters?
a. 50 meters b. 100 meters c. 150 meters d. 590 meters e. 1000 meters
Geoengineering proposals to mitigate climate change include ________.
A. development of wind turbine farms in the open ocean B. large-scale iron fertilization C. increasing rates of denitrification D. enhancement of deep-water formation
Explain how peridotite can melt at a divergent plate boundary without an increase in temperature
What will be an ideal response?
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.