Expansion Theory Spreading The Ocean Floor

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.

Expansion theory spreading the ocean floor.

What do we really know about seafloor spreading and how ocean crust is generated at the earth s mid ocean ridges. Conversely geophysical global cooling was the hypothesis that various features could be explained by earth contracting. Seafloor spreading is the mechanism by which new seafloor lithosphere is constantly being created at mid ocean ridges. Spreading rate is the rate at which an ocean basin widens due to seafloor spreading.

Is the ocean crust as simple and regular as the conventional plate tectonics model would have us believe. This theory introduced by harry hess was proven as patterns of magnetic. The strange fact that the ocean floor is billions of years younger than the earth s land. What actually is the moho seismic horizon beneath the ocean floor long taken as the boundary between crust and the mantle.

Spreading rates determine if the ridge is fast intermediate or slow. Seafloor spreading theory mapping of the ocean floor. The rate at which new oceanic lithosphere is added to each tectonic plate on either side of a mid ocean ridge is the spreading half rate and is equal to half of the spreading rate. Earth expansion advocates fixated on this observation.

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 theory that oceanic crust forms along submarine mountain zones known collectively as the mid ocean ridge system and spreads out laterally away from them. The expanding earth or growing earth hypothesis asserts that the position and relative movement of continents is at least partially due to the volume of earth increasing. Although it was suggested historically since the recognition of plate tectonics in the 1970s.

Explaining the young age of the ocean. To map the oceanic floor provided a detailed picture of the ocean relief. 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.

Seafloor spreading is a geologic process where there is a gradual addition of new oceanic crust in the ocean floor through a volcanic activity while moving the older rocks away from the mid oceanic ridge. The theory of seafloor spreading.