Answer:
C. Downward
Explanation:
Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the heavier plate dives beneath the second plate and sinks into the mantle. A region where this process occurs is known as a subduction zone, and its surface expression is known as an arc-trench complex. The mantle is below the crust, and the crust is the ground where we stand on, and where all life exists. The crust is estimated to be 40km thick (25 miles deep) just 1% of earth's mass.
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