Describe a sea floor spreading?

Question

Describe a sea floor spreading?

Answer 1

Great question. Sea floor spreading is the result of the most dynamic force on Earth. Sea floor spreading is the phenomena of which molten rock is ascended throught the rock column and exposed on the seafloor. Now, one might first question this saying, the Earth cannot build new land, but in reality it is. But, at the same time as the oceanic plate is growing, the continental plate is being compromised to subduction. In turn, this leads to more rock being pushed deeper through the Earth under intense heat and pressure, which in essence becomes molten, and can be surfaced. It is one of the many fascinating cycles of the Earth. Feel free to request additional info.

Answer 2

Sea floor spreading is caused by two  tectonic plates moving apart.  The magma under the plates comes up through the split and new sea floor is created.

Answer 3

Sea floor spreading is the result of two Tectonic plates moving away from one another.  Magma moves up through the resultant rifts and solidifies, forming a ridge.  An example of this is the Mid Atlantic Ridge.  This rift between the North American and Eurasian plates goes on North, splitting Iceland and causing spectacular rift volcanoes there.

Answer 4

Seafloor spreading occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics.

Earlier theories (e.g., by Alfred Wegener) of continental drift were that continents "plowed" through the sea. The idea that the seafloor itself moves (and carries the continents with it) as it expands from a central axis was proposed by Harry Hess from Princeton University in the 1960s. The theory is well-accepted now, and the phenomenon is known to be caused by convection currents in the plastic, very weak upper mantle, or asthenosphere.