TY JOUR TI Three stages of areal growth of the ocean floor and the graviseismic concept of plate tectonics KW graviseismic concept KW five-ocean geostrophe of the Earth's crust KW World Ocean floor KW spreading area rate. JO Vestnik AGGE AU Glebov, A.F. AU Nikolaev, D.A. PY 2026 IS PB Association of Geologists, Geophysicists and Engineers