Where is new ocean floor formed? at ocean trenches on the continental slopes at mid-ocean ridges on the continental shelves?

Option (3)

Explanation:

In a divergent plate motion, two lithospheric plates moves in opposite direction. Due to this motion, sea floor spreading takes place. Here the new materials are added to the ocean bottom along the mid oceanic ridge, where the magma comes out to the ocean bottom surface and immediately solidifies. Here the rocks are mostly basaltic in composition. One of the example is the Mid Atlantic ridge.

The rocks that are found near the mid oceanic ridge are the youngest, and the rocks that are found away from this ridge are the oldest rocks.

Hence, the correct answer is option (3).

d we did this already