The lisphere (literally, the "stone sphere") is the surface and solid part material of which are made the Earth, Mars, Venus, Mercure, etc. It is divid into a certain number of tectonic plates. The lithosphere consists of the crust and the surface part of the higher coat. The lower limit of the lithosphere (its be-with-statement limit between the rigid higher coat and the ductile higher coat) is with the isot where olivine (mineral largely dominating in the coat) reached its point melting: in the neighbourhoods of 1200 °C. This depth varies almost 0 km on the level of the oceanic dorsals, with more than 200 km under the old continents. Because of very partial fusion of minerals constituting it (between 1 and 5 %), the materials become less vious and there is a transport of heat by convection in the asthenosphere, whereas it is done by conduction in the lithosphere. The lisphere (literally, the "stone sphere") is the surface and solid part material of which are made the Earth, Mars, Venus, Mercure, etc. It is divid into a certain number of tectonic plates. The lithosphere consists of the crust and the surface part of the higher coat. The lower limit of the lithosphere (its be-with-statement limit between the rigid higher coat and the ductile higher coat) is with the isot where olivine (mineral largely dominating in the coat) reached its point melting: in the neighbourhoods of 1200 °C. This depth varies almost 0 km on the level of the oceanic dorsals, with more than 200 km under the old continents. Because of very partial fusion of minerals constituting it (between 1 and 5 %), the materials become less vious and there is a transport of heat by convection in the asthenosphere, whereas it is done by conduction in the lithosphere.