Question

which statement describes the cyclic nature of seafloor spreading?
continents are created.
new oceanic crust is created.
volcanoes erupt and remove crust.
old crust gets thicker at subduction zones.

Explanation:

Seafloor - spreading occurs at mid - ocean ridges where new oceanic crust is formed as magma rises and solidifies. Continents are not directly created by seafloor spreading. Volcanoes at mid - ocean ridges add new crust rather than remove it. At subduction zones, old crust is recycled, not getting thicker.

Answer:

New oceanic crust is created.