Seafloor Spreading Evidence Examples And Explanations

Around 250 million years ago the north poles were also different for the two continents the scientists looked again at the three possible explanations.

Seafloor spreading evidence examples and explanations.

This evidence was from the investigations of the molten material seafloor drilling radiometric age dating and fossil ages and the magnetic stripes. Evidence for sea floor spreading. Only one can be correct. Spreading rate is the rate at which an ocean basin widens due to seafloor spreading.

Studies conducted with thermal probes for example indicate that the heat flow through bottom sediments is generally comparable to that through the continents except over the mid ocean ridges where at some sites the heat flow measures three to four times the normal value. Molten rock erupts onto the seafloor there then cools and rifts away from the ridge on either side in a process known as seafloor spreading. A profound consequence of seafloor spreading is that new crust was and still is being continually created along the oceanic ridges. Eruptions of molten material magnetic stripes in the rock of the ocean floor and the ages of the rocks themselves.

Spreading rates determine if the ridge is fast intermediate or slow. First proposed in the early 1960s by the american geologist harry h. Evidence of sea floor spreading harry hess s hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor.

Seafloor spreading theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwater ridges. Several types of evidence supported hess s theory of sea floor spreading. Plate tectonics theory dealing with the dynamics of earth s outer shell that revolutionized earth sciences by providing a uniform context for understanding mountain building processes volcanoes and earthquakes as well as the evolution of earth s surface and reconstructing its past continents and oceans. This evidence led scientists to look again at wegener s hypothesis of continental drift.

Hess its major tenets gave great support to the theory of continental drift continental drift geological theory that the relative positions of the continents on the earth s surface have. 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. For example 400 million year old magnetite in europe pointed to a different north magnetic pole than the same aged magnetite in north america.