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The temperature range at the core-mantle boundary is estimated to be between ____.


A) 2,500 to 5,000C
B) 5,000 to 6,500C
C) 7,000 to 8,500C
D) 8,500 to 10,000C
E) 10,000 to 11,500C

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The structural layer that the P- and S-wave low-velocity zone,in the upper part of the mantle,closely corresponds to is the ____________________.

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The percentage of all earthquakes that occur along a plate boundary is nearly what?


A) 100 percent
B) 95 percent
C) 80 percent
D) 55 percent
E) 25 percent

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The Modified Mercalli Scale is a quantitative measure of an earthquake's intensity.

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Within which belt or zone do the majority of earthquakes occur?

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the circum...

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For every integer increase of magnitude on the Richter Scale,______ times more energy is released by the earthquake.

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What is the estimated average geothermal gradient in the mantle?


A) 10C/km
B) 5C/km
C) 1C/km
D) -2C/km
E) -5C/km

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The focus of the most destructive earthquakes is almost always ____.


A) shallow
B) intermediate
C) deep
D) intermediate and deep
E) none of these

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Why are there so few earthquakes within plate interiors?

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At plate boundaries,adjacent p...

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The term that best describes most tsunamis is ____________________.

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