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The Ring of Fire is a horseshoe-shaped area around the Pacific Ocean. It's home to most of Earth's volcanoes and earthquakes.
When tension from a bending plate releases, earthquakes happen.
In some locations, molten rock pushes through the crust to create volcanoes.
The 9.1-magnitude earthquake in Japan in 2011 was also on the Ring of Fire.
The earthquake triggered massive tsunamis. More than 18,000 people died.