The part of the earth crust which is covered by oceans and seas is the

The part of the earth crust which is covered by oceans and seas is the oceanic crust . The outermost layer of Earth's lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges , which occur at divergent plate boundaries.Hope this helps !!

East european plain and russian russkaya ravina.

A,b,c is the answer to the question