By: Isaac Casarez
Plate Tectonics are plates of the lithosphere that the crust is on. These plates are moved by convection currents that move warm mantle up and cooler mantle lower. This theory was created by Alfred Wegener in 1912. These plates have different boundaries.
Sea Floor Spreading
Sea floor Spreading happens when divergent boundary happens. Its a process that occurs at mid ocean ridges. Where new oceans crust is formed through volcanic activity. Henry Hess had discovered sea floor spreading. Sea floor spreading helps explain the theory of plate tectonics.