Proof Of Seafloor Spreading

On the basis of Tharps efforts and other new discoveries about the deep-ocean floor Hess postulated that molten material from Earths mantle continuously wells up along the crests of the mid-ocean ridges that wind for nearly 80000 km 50000 miles through all. Tuzo said that Earths crust or lithosphere was divided into large rigid pieces called plates.

Sea Floor Spreading The Evidence Ppt Download

The Glomar Challenger was the first research ship designed to drill samples of rock from the deep-ocean floor.

Proof of seafloor spreading. The theory has caused a revolution in the way we think about the Earth. In this way the rugged volcanic. Sea floor spreading is the.

Other supportive evidence has emerged from study of the fracture zones that offset the sections of the ridge. Tuzo Wilson combined the continental drift and seafloor spreading hypotheses to propose the theory of plate tectonics. The Glomar Challenger a drilling ship built in 1968 gathered the samples.

About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features Press Copyright Contact us Creators. Other hot magma from the Earths mantle comes up to the surface. Underwater volcanoes are found here.

These ridges mark the boundaries between two plates that are diverging or moving away from one another. Throughout the Earths history the magnetic pole has flipped North and South Pole swap positions Proof of Seafloor Spreading the reverse or normal polarity is recorded in rockssediments measured by a ship towing a magnetometer Proof of Seafloor Spreading. The motivating force for seafloor spreading ridges is tectonic plate slab pull at subduction zones rather than magma pressure although there is typically significant magma activity at spreading ridges.

This colder and denser seafloor rises sinks and continues to. Since the development of the theory geologists have had to reexamine almost every aspect of. The seafloor spreading hypothesis was proposed by the American geophysicist Harry H.

Seafloor spreading proves that the ocean itself is a site of tectonic activity. Seafloor spreading helps explain continental drift in the theory of plate tectonics. Seafloor spreading disproves an early part of the theory of continental drift.

Proof of seafloor spreading In 1963 Fred Vine and Drummond Matthews two British geologists joined the topographic map of the Mid-Atlantic Ridge with the symmetric bands of magnetism on the seafloor Vine and Matthews 1963. In 1965 a Canadian geophysicist J. A dramatic proof of sea-floor spreading was discovered in the mid 1960s when data revealed alternating stripes of magnetic orientation on the sea floor parallel to the mid-ocean ridges and symmetric across them -- that is a thick or thin stripe on one side of the ridge is always matched by a similar stripe at a similar distance on the other side.

Seafloor spreading occurs when the seafloor spreads apart and hot rocks magma seeps up to the crust where it cools solidifies and forms new seafloor mountain ranges. Gillaspy has taught health science at University of Phoenix and Ashford University and has a degree from Palmer College of Chiropractic. Seafloor Spreading is the usual process at work at divergent plate boundaries leading to the creation of new ocean floor.

Sea-floor spreading occurs along mid-ocean-ridge when the tectonic plates slowly moves away from each. Continental Drift Sea Floor Spreading and Plate Tectonics Plate Tectonics is a theory developed in the late 1960s to explain how the outer layers of the Earth move and deform. Seafloor spreading is a process that occurs at mid-ocean ridges.

When oceanic plates diverge tensional stress causes fractures to occur in the lithosphere. Supporters of continental drift originally theorized that the continents moved drifted through unmoving oceans. The final proof of sea-floor spreading came from rock samples obtained by drilling into the ocean floor.

As magma cools by the seawater the rock forms a new part of the crust. As two tectonic plates slowly separate molten material rises up from within the mantle to fill the opening. The magnetic history of the earth is thus recorded in the spreading ocean floors as in a very slow magnetic tape recording forming a continuous record of the movement of the ocean floors.

Magnetic Evidence For Seafloor Spreading Ck 12 Foundation