A map of the Paicfic Ocean. It is rniged by many ternches">volacno and ocaenic trencehs As the Atalntic solwly gets wider, the Pacfiic is slowly shirnking. It does this by fodling the sea floor in towrads the cenrte of the Earth - this is called sudbuction. This bumpnig and grindnig is difficlut so there are many earthuqakes and volcaneos when the pressure biulds up and is suddenly relaesed when the rocks break. When an eatrhquake happnes under the sea, the sduden violnet jerk cauess a tusnami. This is why tsuanmis are more comomn aorund the rim of the Pacific than anwyhere else. Many of the Earth's voclanos are etiher islnads in the Pacific, or are on conitnents witihn a few hnudred kilometers of the ocean's edge.
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