What is the plate

Earth can be simply divided into crust, mantle and core. In addition to the composition of Earth's physical properties of substances can be divided into the Earth's lithosphere and asthenosphere. Earth's lithosphere is the most external cold and hard material: the lithosphere under the asthenosphere is higher by the heat plastic composed of precursor substances. "Plate" refers to the lithosphere, which includes part of the crust and mantle. 

  Earth's crust there are many cracks. These cracks in the deep sea bed, from the cracks in continuous outflow of hot magma. Magma cooled, it solidified into a new crust. 

  Keep the earth's crust because the new generation, will be the original crust is pushed outward, so the crust on land and sea will be followed by a block below the earth's crust to move. Mobile when the earth's crust below the earth's crust and upper mantle will move along with, so we put together under the earth's crust is linked to move part of a letter known as a plate. 

  Earth's surface is divided into 7 main sections, including the Pacific Plate, the Eurasian Plate, the North American Plate, the South American Plate, the African Plate, Indo-Australian Plate and the Antarctic plate.

Theory of plate movement is a natural development of the twentieth century a major achievement. In simple terms, this theory will not only advocate plate movement, and their movement patterns to comply with certain rules: plate of new substances in the mid-ocean ridges (mid-ocean ridge) to generate, and then expand outwards until the encounter with another plate and after , heavier on one side down and return to red letter. Therefore, the whole process of which is equivalent to a huge circle of the transport system, while the plate down red letter back to the region that is known as the subduction zone. 

         As the plate is the hard part of the lithosphere, so the edge in its two plates collide with each other (such as subduction zone) that is generated considerable stress, when the stress exceeds the strength of rock can bear, the rocks that have broken This is an earthquake. This also explains why the distribution of seismic activity and plate boundaries are so closely related.