Why is it possible for rock avalanches to move at speeds in excess of 200 kilometers per hour?
A) They are moving with large quantities of water.
B) They are moving with molten material such as lava.
C) They are moving with large quantities of air trapped and compressed beneath the debris.
D) They are moving with large chunks of ice compressed beneath the moving material.
Answer: C
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A) primarily restricted to the rich countries of the world. B) primarily restricted to the poor countries of the world. C) equal throughout the world. D) of no consequence to the future of social security programs being paid by the young. E) more serious than the massive young population of the developing world.
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Indicate whether the statement is true or false
Which material will "float" higher on the mantle: 5 km thick oceanic crust or 40 km thick continental crust? Why?
What will be an ideal response?