Centers of cultural innovation are also called cultural:
A) zones
B) heartlands
C) hearths
D) brains
C
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Of the total energy that falls on their leaves, what percent do producers on average convert to chemical energy through the process of photosynthesis?
a. 0% b. 1% c. 10% d. 25% e. 50%
Which of the following substances can be condensation nuclei?
A. smoke from forest fires B. pollen particles C. phosphoric acid particles D. salt from mines
Ozone is found primarily in the ________ and is important because of ________
A) stratosphere; its interaction with ultraviolet radiation B) troposphere; it enhances thunderstorm development C) mesosphere; it makes the mid-levels of the atmosphere cold D) thermosphere; it makes the upper levels of the atmosphere very warm
A "dynamic low" is produced by ________
A) very warm surface conditions B) very cold surface conditions C) the strong rise of air D) the strong descent of air E) many kilometers of smooth Earth surface