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.
B
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Which of the following reasons for climatic change is proposed by the Milankovitch theory?
A. volcanic eruptions B. changing levels of CO2 in the Earth's atmosphere C. particles suspended in the Earth's atmosphere D. variations in the Earth's orbit as it travels through space
Describe what hurricanes are, were they originate, how they grow, and how they die
What will be an ideal response?
The Northwest Land Ordinance was set up by Thomas Jefferson as a way to quickly survey land. Its impacts can still be seen ________
Fill in the blank(s) with correct word
Alcohol and pickling solutions were probably widely developed because they
A. Have more interesting flavors than other solutions for seasoning B. Are effective insecticides in the home C. Preserve food due to their pesticidal properties D. Neutralize toxins in foods E. All of these are good reasons why alcohol and pickling solutions were used