Question

what does the presence of new rock near an oceanic ridge indicate?
○ there is always a deep-sea trench underneath.
○ there is evidence of seafloor spreading.
○ they are made from oceanic crust.
○ they have iron oriented in different directions.

Explanation:

Oceanic ridges are sites where tectonic plates diverge. New oceanic crust forms here as magma rises, cools, and solidifies, which is the defining process of seafloor spreading. Deep-sea trenches form at subduction zones (convergent boundaries), not ridges. While new ridge rock is oceanic crust, this is a description, not what its presence indicates. Iron orientation records magnetic reversals, but this is a supporting detail, not the main implication of new rock at ridges.

Answer:

There is evidence of seafloor spreading.