Our textbook discusses the cosmic calendar, a model of the history of the universe scaled to a single year. The length of time represented by one month on this cosmic calendar is therefore
A) about ten million years.
B) about one million years.
C) about one billion years.
D) about ten billion years.
E) about 1000 years.
Question 2
If the Earth were to warm up a bit, what would happen?
A) There would be a runaway greenhouse effect, with the Earth becoming ever hotter until the oceans evaporated (as may have happened on Venus).
B) Carbonate materials would form in the oceans more rapidly, the atmospheric CO2 content would decrease, and the greenhouse effect would weaken.
C) Carbonate materials would form in the oceans more rapidly, the atmospheric CO2 content would decrease, and the greenhouse effect would strengthen.
D) Carbonate materials would form in the oceans more slowly, the atmospheric CO2 content would increase, and the greenhouse effect would strengthen.
E) The ice caps would melt and cool the Earth back to its normal temperature.
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