The amount CO2 that entered the atmosphere during the Paleocene-Eocene Thermal Maximum (PETM) is estimated to be the equivalent of
A) the amount released to the atmosphere by the 1991 Mount Pinatubo eruption.
B) the amount human activity would release to the atmosphere with the burning of all Earth's fossil-fuel reserves.
C) burning all of Earth's fossil fuel supply repeatedly 100 times over a 50 year period.
D) the amount released to the atmosphere due to agricultural practices and rapid human population growth in China since 1980.
E) the amount released to the atmosphere since the beginning of the industrial revolution.
B
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What will be an ideal response?
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Indicate whether the statement is true or false
The price of a liter of gasoline is determined by
A. the cost of processing crude oil into gasoline. B. state and federal taxes. C. the cost of purchasing crude oil. D. All of these are correct. E. Only the cost of processing crude oil into gasoline and state and federal taxes are correct.
Which of the following best describes a seismic gap?
A. A large crack in the ground that opens in response to earthquake activity. B. The time interval between when an earthquake originates and when it's felt at distant locations. C. A section of an active fault that has not experienced an earthquake for an extended period of time D. The time interval between when an earthquake originates and when its aftershocks begin. E. A portion of a seismograph record where data is missing due to seismic waves being blocked by a mountain range.