Which statements describe the cyclic nature of seafloor spreading? check all that apply. a) continents are created. b) new oceanic crust is created. c) volcanoes erupt and produce more crust. d) old crust is destroyed at subduction zones. e) old crust is pushed away from oceanic ridges.

B,C, This process is called mantle convection.

The correct statements are options b, d and e.  

Explanation:

A geologic procedure in which tectonic plates get dissociate apart generating new seafloor. The seafloor spreading takes place due to the mantle convection that is the gradual and churning movement of the mantle. It takes place at divergent plate boundaries.  

The spreading of seafloor takes place along the mid-ocean ridges, and the pushing of the old crust from the oceanic ridges occurs. The oceanic crusts move gradually from the oceanic ridges and the locations of the spreading of the seafloor forming them cooler, and more thick and dense.