Why Is The Sea Floor Spreading

Using new data analysis techniques nasa scientists have confirmed the earth isn t expanding putting to rest years of rumors that the earth is growing.

Why is the sea floor spreading.

Seafloor spreading theory that oceanic crust forms along submarine mountain zones and spreads out laterally away from them. Hess went on to say that as the ocean crust spreads and cools over millions. This idea played a pivotal role in the development of the theory of plate tectonics which revolutionized geologic thought during the last quarter of the 20th century. Seafloor spreading is a geologic process where there is a gradual addition o.

Dietz and hess were among the small handful who really understood the broad implications of sea floor spreading. For instance the atlantic ocean is believed to be expanding because of its few trenches. If the earth s crust was expanding along the oceanic ridges hess reasoned it must be shrinking elsewhere. The mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate the east pacific rise is a mid ocean ridge that runs through the eastern pacific ocean and separates the pacific plate from the north american.

Spreading rates determine if the ridge is fast intermediate or slow. He suggested that new oceanic crust continuously spread away from the ridges in a conveyor belt like motion. As upwelling of magma continues the plates continue to diverge a process known as seafloor spreading samples collected from the ocean floor show that the age of oceanic crust increases with distance from the spreading centre important evidence in favour of this process. Seafloor spreading is a process that occurs at mid ocean ridges where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.

This theory introduced by harry hess. Seafloor spreading is the mechanism by which new seafloor lithosphere is constantly being created at mid ocean ridges. These age data also allow the rate of seafloor spreading to be determined and they show that rates. Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor.

Due to this continuous seafloor spreading occurs and makes atlantic ocean floor to be connected to other continental crust making the ocean gets wider over the time. Subduction and sea floor spreading are processes that could alter the size and form of the ocean.