Oxygen (O2) is being added to the atmosphere by ________
A) solar radiation
B) animal decomposition
C) meteorites
D) vegetation
E) the burning of coal
Answer: D
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A) Denmark B) Germany C) New Zealand D) Russia E) Guatemala
Which of the following elements might be the fuel in a fusion reaction?
A) helium B) hydrogen C) iron D) uranium
Tyco Brahe set out to disprove Copernicus, so why is he famous for developing modern astronomical theory?
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Which of the following is the standard unit of ocean depth?
A) Mile B) Fathom C) Foot D) Meter E) League