Seafloor Spreading Theory By

Tuzo said that earth s crust or lithosphere was divided into large rigid pieces called plates.

Seafloor spreading theory by. In 1965 a canadian geophysicist j. The age of different rocks on earth s surface e. According to hess s theory what might happen if the magma under a mid ocean ridge cools. Seafloor spreading disproves an early part of the theory of continental drift.

Sea floor spreading theory. When oceanic plates diverge tensional stress causes fractures to occur in the lithosphere. 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. As per seafloor spreading theory the mid oceanic ridge is the region where at the crest of oceanic ridges through the rupture of the oceanic crust and the crack continuous new lava eruption thrusts into it consequently pushing the oceanic crust on either side.

Supporters of continental drift originally theorized that the continents moved drifted through unmoving oceans. 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 plates on either side of the. First proposed in the early 1960s by the american geologist harry h.

These age data also allow the rate of seafloor spreading to be determined and they show that rates. These plates float atop an underlying rock layer called the asthenosphere. 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. It leads to the formation of new material on the ridge.

What evidence supports hess s theory of seafloor spreading. Seafloor spreading helps to explain continental drift in the theory of plate tectonics. Seafloor spreading proves that the ocean itself is a site of tectonic activity. Check all that apply.

Seafloor spreading theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwater ridges. Pillow shaped rocks found in the sea. In 1912 when alfred wegener proposed that the continents had once been joined together and had split apart the biggest weakness in his hypothesis was the. The direction iron in ocean rocks points d.

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. The theory of seafloor spreading.