What did Sir Isaac Newton do during the seventeenth century?
A) calculate that a rotating planet would not be perfectly spherical
B) determine the mass of Earth
C) determine that the Earth has a distinct concentration of high-density material near the center
D) use simple surveying and measurements of shadows in sunlight to estimate Earth's size
Answer: A
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Which of the following Middle Eastern countries/authorities has no Palestinian refugees?
A) Israel B) Gaza and the West Bank C) Jordan D) Syria E) Lebanon
Phytoremediation is a form of bioremediation that
a. is essentially the same, but more costly b. involves the use of photosynthetic bacteria c. produces more air pollution and is thus not as helpful d. involves the use of plants e. can only work on toxic metal leachate
__________ organisms rely on external sources of nutrients. Fill in the blank(s) with the appropriate word(s)
Which Earth system component absorbs more carbon than it releases?
A. atmosphere B. geosphere C. hydrosphere