Question

what is called Pacific Ring of Fire why it is called so

Answer 1

Here is your answer
The area encircling the Pacific Ocean is called the "Ring of Fire," because its edges mark a circle of high volcanic and seismic activity (earthquakes). Most of the active volcanoes on Earth are located on this circumference.
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Answer 2

Hi mate
SARVESH is here

Pacific ring of fire is a part of pacific ocean in this region most of the times volcanic eruptions ,earthquakes and different other types of volcanoes occurres in this red area .

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