What process formed heavy elements, such as iron, found in your body?
A. They formed during the Big Bang.
B. They formed in the Earth's core during its early stages.
C. They formed during supernovae of ancient stars.
Answer: C
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Why is carbon better than lead as a moderator in nuclear reactors?
A) Carbon produces the high energy, high speed neutrons necessary for maintaining the nuclear chain reaction. B) Carbon slows down the neutrons making them more effective in stimulating the nuclear chain reaction. C) Lead absorbs the neutrons rather than allowing them to rebound to maintain the nuclear chain reaction. D) Lead slows down the neutrons making them less effective in stimulating the nuclear chain reaction.
Which of the following is an example of a species that is NOT likely to become extinct soon?
A. whooping crane B. rabbits C. cheetah D. All of these are correct.
Windblown loess, like sand, typically accumulates as mound-like dunes
Indicate whether the statement is true or false
What could happen if death and decay did not occur?
A) the wastes generated by organisms would not decompose and, consequently, the surface of the earth would become covered with non-decaying animal wastes B) the decomposer component of the food chain would not be operating C) Nutrient cycling would stop, so soils would eventually lose their fertility, plants would not be able to grow, and the food chain would collapse D) all of the above E) A and B only