What event sets off the process that creates an atoll?

Name: What event sets off the process that creates an atoll?
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Atolls are formed through a process known as subsidence, which starts with a volcanic eruption. After the eruption, the lava cools and solidifies, creating a volcanic island that eventually subsides beneath the ocean's surface. Over time, coral reefs grow around the island's submerged remnants, creating a circular or ring-shaped reef system called an atoll.

What Event Sets Off the Process That Creates an Atoll