Electrons?
a. ?are negatively charged.
b. ?are positively charged.
c. ?carry no charge.
d. ?can carry either positive or negative charge.
e. ?go back and forth between positive, negative, and neutral.
ANSWER: a
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The Bormann-Likens study in the Hubbard Brooks Experimental Forest in New Hampshire can best be described as
a. a comparison of a control site with an experimental site in nature b. what can occur in a forest watershed without plants to absorb water c. an example of how scientists learn about the effects of our actions on natural systems d. a comparison of a control site with an experimental site in nature and a study of what can occur in a forest watershed without plants to absorb and retain water e. a comparison of a control and an experimental site, a study of what can occur in a forest watershed without plants to absorb water, and an example of how scientists learn about the effects of our actions on natural systems.
Why did coal replace wood as the dominant fuel source?
A. It is easier to find. B. It is more energy dense. C. It is easily converted to a liquid. D. It is less expensive to produce.
Characteristic of central Greenland:
From Table 29.1, the biome map, and the climate map, determine the terrestrial biome that best characterizes each of the following descriptions and write its name on the first line provided. On the second line, relate it to temperature and precipitation regimes and/or global pressure and wind belts outlined at the end of Section 1.
Tundra biomes occur
A. Only at high latitudes B. Almost exclusively on Antarctica C. Where rainfall is too great for tree growth D. At high latitudes, where temperatures are low E. At high latitudes and altitudes, where the growing season is short