The average length of a period during which a given magnetic field polarity exists is about
A) 10,000 years.
B) 100,000 years.
C) 500,000 years.
D) 1,000,000 years.
C
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The greatest temperature ranges in the region, due to the effect of continentality, are experienced in:
A. Estonia. B. Siberia. C. Armenia. D. the Volga Basin.
A higher power for the IDW method means that:
A. Closer control points will have greater influence on the estimation. B. Control points will be equalized in terms of their influence on the estimation. C. Closer control points will have less influence on the estimation.
Which of the following accurately describes annual groundwater withdrawal in the United States and Canada?
A) Withdrawals increased 150 percent between 1950 and 2000. B) The percentage of withdrawals in the United States and Canada are about the same. C) Groundwater pumping is presently not exceeding water recharge rates. D) The amount withdrawn is equal to river discharges in the United States.
The current data indicate that the record high global temperatures of the past two decades correspond to record high atmospheric CO2
Indicate whether the statement is true or false