In the modern theory of crustal motion on Earth's surface, the process of seafloor spreading is described as the
A) motion of plates toward mid-oceanic ridges and away from continental boundaries.
B) motion of plates away from mid-oceanic ridges and toward continental boundaries.
C) northward motion of some plates and the southward motion of others, causing earthquakes where they slide past each other.
D) rotation of plates around axes that remain stationary on Earth causing plate-edge collisions.

Question

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Seafloor spreading is described as the motion of tectonic plates away from mid-oceanic ridges, where new oceanic crust is formed, and toward continental boundaries. This process is part of the larger theory of plate tectonics, which explains the movement of Earth's lithosphere.

In the Modern Theory of Crustal Motion on Earth's Surface