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| Below the surface of the ocean the boundaries of the plates are either growing or sinking. At mid-ocean ridges the seafloor at the edges of the plates are growing. The seafloor sinks into the trenches and is shoved down below the surface of the earth. That means that the land is always being recycled from the top to the bottom and bottom to top in a kind of cycle. The sinking places are called subduction zones. At subduction zones the layers of rocks are crushed and folded under and melted. Volcanoes mostly form along subduction zones. Most of the volcanoes on earth are in a place called the Ring of Fire. The Ring of Fire is around the edges of the land that surround the Pacific Ocean. | ||
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| There are three kinds of ways that plate boundaries are formed. They are transform, divergent, and convergent plate boundaries.Transform boundaries move back and forth in opposite directions from each other. At divergent boundaries the plates move away from each other. Convergent plate boundaries are where plates slam into each other. | ||