Thunderstorms are more likely to form at a(n) ____________________ front
Fill in the blank(s) with correct word
cold
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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.
Each tree ring documents one year of growth.
Answer the following statement true (T) or false (F)
Who sailed from Europe around the tip of Africa to India and established a new trade route?
A) Giovanni Caboto B) Ferdinand Magellan C) Juan Sebastian del Caño D) Vasco Nunez de Balboa E) Vasco da Gama
Softwood trees ________
A) always have soft wood B) tend to have complicated cellular structures C) are largely evergreen trees D) are largely deciduous trees E) are usually angiosperms