Marijuana on Federal Lands. Posted: January 27, 2014. With the legalization of marijuana in the State of Colorado, Mesa Verde National Park would like to provide clarification regarding the use of possession of marijuana on Federal lands.
Plate Tectonics. Plate tectonics is the movement of the Earth's crust through convection currents that occur in the mantle. Divergent plate boundaries occur where hot magma rises to the surface, pushing the plates apart. The mid-ocean ridges form at divergent plate boundaries.
These large pieces of rocks are called tectonic plates. Tectonic plates never stop moving, this process is called continental drift. Tectonic plates move because of convection currents. These convection currents happen in the mantle, underneath the tectonic plates. The heat, which causes the convection currents, is produced from the radioactive decay left over from the Earths formation. The reason why convection currents are relevant to the moving of tectonic plates is because the heat builds up pressure underneath the crust (tectonic plates).