Layers of the Earth
Layers of the Earth
Plate Tectonics
In 1858, geographer Antonio Snider-Pellegrini made these two maps showing
his version of how the American and African continents may once have fit
together, then later separated.
Plate Tectonics
Not until the 1960’s had geologists amassed enough
evidence to support the existence of large moving plates;
which became the Theory of Plate Tectonics.
Plate Tectonics
The Theory of Plate Tectonics describes the movement of the
Earth’s surface. It presumes the lithosphere is divided into plates and
convection currents within the mantle move these plates.
Plate Boundaries
Divergent plate boundaries
Divergent plate boundaries
Great Rift Valley
Mid-Atlantic Ridge
Red Sea
Convergent plate boundaries
Convergent plate boundaries
-Himalaya-
Convergent plate boundaries
Convergent plate boundaries
-Andes-
Transform plate boundaries
Within the plates
there are various
deformations that
occur including
faulting.