Where are most of the earth’s active volcanoes concentrated?

(A) Europe
(B) Pacific Ocean
(C) Africa
(D) South America

Correct Answer : Pacific Ocean
Question Asked : SSC Combined Graduate Level Prelim Exam 1999
Explanation : The Pacific Ring of Fire is an area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. In a 40,000 km horseshoe shape, it is associated with a nearly continuous series of oceanic trenches, volcanic arcs, and volcanic belts and/ or plate movements. The Ring of Fire has 452 volcanoes and is home to over 75% of the world’s active and dormant volcanoes. It is sometimes called the circum- Pacific belt or the circum-Pacific seismic belt. About 90% of the world’s earthquakes and 81 % of the world’s largest earthquakes occur along the Ring of Fire. The next most seismic region (5-6% of earthquakes and 17% of the world’s largest earthquakes) is the belt which extends from Java to Sumatra through the Himalayas, the Mediterranean, and out into the Atlantic. The Mid-Atlantic Ridge is the third most prominent earthquake belt.
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