What Is The Major Evidence That Seafloor Spreading Creates New Lithosphere?

What evidence supports the theory of seafloor spreading?

Earthquake zones [175 k] The recognition of such a connection helped confirm the seafloor-spreading hypothesis by pin-pointing the zones where Hess had predicted oceanic crust is being generated (along the ridges) and the zones where oceanic lithosphere sinks back into the mantle (beneath the trenches)..

What is seafloor spreading and who is responsible for the theory?

Seafloor spreading is the mechanism by which new seafloor lithosphere is constantly being created at mid-ocean ridges. This theory, introduced by Harry Hess, was proven as patterns of magnetic field polarity preserved in seafloor basalt and by age dating of the rocks.

What are the three types of seafloor spreading?

There are three types of plate-plate interactions based upon relative motion: convergent, where plates collide, divergent, where plates separate, and transform motion, where plates simply slide past each other.

Which is the first step in the seafloor spreading process?

Sea-Floor Spreading begins at a mid-ocean ridge, which forms along a crack in the oceanic crust. along the ridge, molten material that forms several kilometers beneath the surface rises and erupts. at the same time, older rock moves outward on both sides of the ridge.

How did a study of magnetic field reversals support seafloor spreading?

How did a study of “Magnetic Field Reversals” support seafloor spreading? … Drill cores from the ocean floor were dated and found to be very young compared to the age of the earth. This means the crust had to be formed recently, which can be explained by creation of crust at a spreading center.

What type of plate movement creates seafloor spreading?

Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense.

How does Earth’s magnetic field provide evidence for seafloor spreading quizlet?

How does paleomagnetism serve as evidence for seafloor spreading? Because the existence of reversals of Earth’s magnetic field was established, the fact that alternating chrons exist in lines roughly parallel to mid-ocean ridges indicates that the bands had formed during different periods of magnetic orientation.

What is the importance of seafloor spreading?

Significance. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.

What is the first step of seafloor spreading?

A crack forms in oceanic crust. Molten rock rises up through oceanic crust. Molten rock solidifies at the center of the ridge.

Who founded seafloor spreading?

Harry HessHarry Hess: One of the Discoverers of Seafloor Spreading main content.

Where in the Pacific do you notice the same type of pattern as seen in the Atlantic?

Where in the Pacific do you notice the same type of pattern as seen in the Atlantic? The southern Pacific Ocean has a similar symmetric pattern to the seafloor ages of the Atlantic Ocean.

What is meant by a plate of lithosphere?

Lithospheric plates are regions of Earth’s crust and upper mantle that are fractured into plates that move across a deeper plasticine mantleWhat large-scale earth feature is associated with divergent margins?