The downdraft in an ordinary thunderstorm is created mainly by:
a. the melting of snow in the anvil
b. electrical attraction between the cloud and ground
c. the release of latent heat as water in the cloud freezes
d. evaporating raindrops that make the air cold and heavy
e. upper level wind motions
d
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The most abundant rock-forming minerals are the nonferromagnesian silicates called the
____________________. Fill in the blank(s) with the appropriate word(s).
All the following make enzymes or other substances important to digestion except the
A) pancreas. B) small intestine. C) gall bladder. D) liver.
Globally, genetically modified crops are being used
A) increasingly in developed nations but not in developing nations. B) increasingly in developing nations but rarely in developed nations. C) increasingly in both developing and developed nations. D) less in developing and developed nations.
Which of the following terms is not a correct reference to a desert pavement?
A) reg desert B) sand seas C) gibber plain D) lag gravels E) gobi