Annotation
				It is shown that the mechanism of subduction and accumulation of the masses of oceanic platforms leads to a slow decrease of the Earth's mean radius at a rate of $\sim\:$0.35 mm/year.
						© 2016 Publisher M.V.Lomonosov Moscow State University
				
					Authors
				Yu.V. Barkin
Sternberg State Institute of Astronomy, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
				Sternberg State Institute of Astronomy, Moscow State University, Leninskie Gory, Moscow, 119992, Russia



