One of the large, fairly rigid blocks into which earth's lithosphere is broken a long chain of mountains on the ocean floor where seafloor spreading is occurring the process along a convergent boundary where one plate sinks under another a plate boundary where two plates slide horizontally past each a long, narrow valley formed where two tectonic plates split answers: tectonic plate mid-ocean ridge subduction transform boundary rift valley

One of the large, fairly rigid blocks into which Earth's lithosphere is broken tectonic plate A long chain of mountains on the ocean floor where seafloor spreading is occurring mid-ocean ridge The process along a convergent boundary where one plate sinks under another plate subduction A plate boundary where two plates slide horizontally past each other transform boundary  A long, narrow valley formed where two tectonic plates split apart rift valley

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explanation:

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