What is the Pacific Ring of Fire caused by

The ring of fire is a ring of volcanoes around a Pacific ocean that results from subduction

of oceanic plates beneath lighter continental plates.

Explanation:

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

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