What features of the ocean floor indicate tectonic activity?

The Earth's surface is covered by a series of crustal plates.The ocean floors are continually moving, spreading from the center, sinking at the edges, and being regenerated.Convection currents beneath the plates move the crustal plates in different directions.The source of heat driving the convection currents is radioactivity deep in the Earths mantle.

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Answerhave flowing water either episodically or during only a portion of the year;