Question

from which location does seafloor spreading originate?
○ mid-ocean ridges
○ edges of continents
○ deep-ocean trenches
○ underwater volcanoes

Explanation:

Seafloor spreading is a process in plate tectonics where new oceanic crust is formed. Mid - ocean ridges are underwater mountain ranges where tectonic plates are moving apart. Magma rises from the mantle at mid - ocean ridges, cools, and forms new oceanic crust, which is the basis of seafloor spreading. Edges of continents are not the origin of seafloor spreading. Deep - ocean trenches are associated with subduction (where one plate is forced under another), not seafloor spreading. Underwater volcanoes can be a result of seafloor spreading or other volcanic activity, but not the origin of seafloor spreading.

Answer:

A. mid - ocean ridges