Approximately how long has it been since the last magnetic reversal?
A) 1,780 years
B) 17,800 years
C) 780,000 years
D) 1.768 million years
Answer: C
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Based on current trends, predict the population change for each world region until 2050
What will be an ideal response?
In the 1989 Loma Prieta quake, the Marina District building collapses were extensive, and numerous destructive fires broke out, due to all but which one of the following?
A. Widespread looting and arson B. Amplified shaking C. Deformation and liquefaction of artificial-fill foundations D. Soft first-story construction that led to building collapses
Which process is critical in the migration of iron and aluminum from A to B horizons in soils?
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Most of the water on Earth can be found in ____
a. the atmosphere b. the ocean c. groundwater d. glaciers e. rivers and lakes