Question 3 of 20 Ninety percent of the world's earthquakes occur around the:
O A. Pacific Ocean rim.
B. Indian Ocean basin.
O C. Mid-Atlantic Ridge.
D. coast of Africa.

a. Pacific ocean rim

Explanation:

The world's greatest earthquake belt, the circum-Pacific Ocean rim, is found along the rim of the Pacific Ocean, where about 81 percent of our planet's largest earthquakes occur. It has earned the nickname "Ring of Fire". Why do so many earthquakes originate in this region? The belt exists along the boundaries of tectonic plates, where plates of mostly oceanic crust are sinking (or subducting) beneath another plate. Earthquakes in these subduction zones are caused by slip between plates and rupture within plates. Earthquakes in the circum-Pacific Ocean rim include the M9.5 Chilean Earthquake [Valdivia Earthquake] (1960) and the M9.2 Alaska Earthquake (1964).

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