Techtonic plates move under the earth moving land and water.
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The plates under the ocean are part of Earth's lithosphere, known as oceanic plates. These plates float on the semi-fluid asthenosphere beneath them and interact with each other at plate boundaries, influencing geological processes like seafloor spreading, subduction, and volcanic activity.
one plate, the pacific plate
They are called trenches.
those are tecktonic plates which are delicate.when they move crackes occur. when tecktonic plates move under water it creates viberations which causes tsunamis.
The continents and the ocean floor rest upon the plates.
sinks