the plate tectonics is the theory of global tectonics in which the lithosphere is divided into several plates whose pattern of horigonal movement in which the ridge masses of lithosphere intrect oneanother. at there boundaies , causing scismic , volcanic activities along there boundaires
Scientists began learning about the tectonic plates and seismic activity under the ocean after World War II. They were able to use the sonar equipment that was developed during the war to study the ocean floor and this led to their studies of the tectonic plates.
Plate tectonics describes how the continental crust and the oceanic crust move and shift since they are above the mantle. Heat from deep within the Earth causes the movement. Plates can converge or move toward eachother. This can lead to mountain building, earthquakes or volcanic eruptions. Plates can move apart, leading to fault lines and more seismic activity. An example of this is the San Andreas Fault in California, where earthquakes are a common occurrence. It is interesting to note that at one time, the continents were all joined and are now in the positions that we currently see on a map. However, the fossil and rock record provide evidence for the fact that the continents were at one time together, moved apart over millions of years to their current locations and continue to slowly move. The Earth is not a static place, but an ever- changing planet, both geologically and biologically.
The theory of plate tectonics was developed during the 1960s or 1970s. The effects of its development has done for understanding how the world works with Darwin's theories did for understanding biology and how life works. The theory holds that the earth is divided into 7 major plates and other minor plates, and these move according to three different types of boundaries: convergent, divergent and transforms.