Which statements describe the cyclic nature of seafloor spreading? continents are created. new oceanic crust is created. volcanoes erupt and produce more crust. old crust is destroyed at subduction zones. old crust is pushed away from oceanic ridges

The correct answers are:

- New oceanic crust is created;

At a divergent plate boundary, the plates are moving away from each other, thus living a space between them. That space is filled in by the magma penetrating from the mantle layer, and as it cools off it creates the new oceanic crust.

- Old crust is destroyed at subduction zones;

The newly formed crust is pushing the old crust away at the edges. When the old crust comes into a situation to be at a convergent boundary, it will start subducting, thus go into the mantle layer and get destroyed.

- Old crust is pushed away from oceanic ridges;

The new crust formed at the oceanic ridges is building on mass and size constantly, so it is pushing the old crust away towards the edges of the plates.

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