Information on Plate Tectonics
The theory of plate tectonic was developed by Alfred Wegener every one thought he was crazy but after his death the usage of sonar equipment came into use and a ship captain noticed the sea floor spreading. Plate Tectonics is made 52 tectonic plates which move became of the convection currents located in the mantle which is the biggest layer of the earth it is hotter and denser that the crust because if you go deeper inside the pressure increases. The uppermost part of the mantle is the coolest part of the mantle . Convection currents are which hot liquids or gases follow in patters up and down. The upper part of the lithosphere melts rocks which forms lava and then later cools as magma.