The theory of plate tectonics combines many of the ideas about continental drift and sea-floor spreading. The Plate Tectonic tell us that the
lithosphere is broken into a mosaic of oceanic and continental plates which can slide over the aesthenosphere , which is the upper most layer of the mantle. These plates are in a constant motion. The lithosphere covers the whole earth. That why ocean plates are also involved . ;like with the procedure on the sea floor-spreading.
Tectonic plates are able to move because the Earth's lithosphere has a higher strength and lower density than the underlying asthenospheres density variations in the mantle result in convection Plate movement is thought to be driven by a combination of the motion of the seafloor away from the spreading ridge (due to variations in topography and density of the crust, which result in different in the garvitational forces)and drag at the subduction zones.
These are types of plate boundaries:
lithosphere is broken into a mosaic of oceanic and continental plates which can slide over the aesthenosphere , which is the upper most layer of the mantle. These plates are in a constant motion. The lithosphere covers the whole earth. That why ocean plates are also involved . ;like with the procedure on the sea floor-spreading.
Tectonic plates are able to move because the Earth's lithosphere has a higher strength and lower density than the underlying asthenospheres density variations in the mantle result in convection Plate movement is thought to be driven by a combination of the motion of the seafloor away from the spreading ridge (due to variations in topography and density of the crust, which result in different in the garvitational forces)and drag at the subduction zones.
These are types of plate boundaries:
- Transform boundaries occur where plates slide or grind past each other along transform faults.
- Divergent boundaries occur where two plates slide apart from each other. Mid-ocean ridges (e.g.,Mid-Atlantic) and active zones of rifting (such as Africa's East African Rift) are both examples of divergent boundaries.
- Convergent boundaries occur where two plates slide towards each other commonly forming