How are oceans formed by plate tectonics?
Formation of Ocean:
Geologically, oceans and seas are believed to be formed due to plate tectonics. The earth's topmost layer, called the lithosphere, comprising the upper mantle and the crust is not a solid bedrock but made up of large pieces of solid, irregularly shaped rocks that tend to float on the partially molten mantle. These large pieces of rocks that make up the lithosphere are called tectonic plates. It is the continuous movement of the tectonic plates that bring about changes in the landforms on earth. The formation of mountains and valleys can be attributed to plate tectonics.
Answer and Explanation:
Oceans are formed when tectonic plates move apart at their divergent boundary, causing crustal extension. This spreading of the earth's crust mostly...
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from College Earth Science: Help and ReviewChapter 17 / Lesson 15