Океаны

Given that simulations of water delivery to habitable zone terrestrial planets predict water mass fractions of 1/100000 – 1/100… we conclude that most tectonically active planets — regardless of mass — will have both oceans and exposed continents, enabling a silicate weathering thermostat.

From the paper by Cowan and Abbot, “Water Cycling Between Ocean and Mantle: Super-Earths Need Not be Waterworlds,” The Astrophysical Journal Vol. 781, No. 1 (2014)

http://www.centauri-dreams.org/?p=29785