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

Environmental & Atmospheric Sciences

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__________ organisms rely on external sources of nutrients. Fill in the blank(s) with the appropriate word(s)

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Which Earth system component absorbs more carbon than it releases?

A. atmosphere B. geosphere C. hydrosphere

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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

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