Theory Of The Earths Floor Spreading Question And Answers

It is an underwater mountain range that forms when magma pushes up on the crust at a divergent boundary.

Theory of the earths floor spreading question and answers.

This is a mid ocean ridge. Centrifugal force from the spinning earth mantle convection cells the pull of the sun and the moon and associated gravitational forces the earth s magnetic field ocean currents dragging along the seafloor. This is a 50 000. Questions and answers 1.

2 in the 1960 s scientists finally found what was missing in wegener s theory. 3 the mid ocean ridge is found throughout the oceans of the earth. Subduction theory supposes that converging plates are destroyed below ocean trenches. Using paleomagnetism these rocks were known to have preserved an imprint of the changes in the earths magnetism over long periods of geological time which proved the theory of sea floor spreading.

Corollary to the idea of plate accretion by sea floor spreading is the notion of plate destruction by subduction. Is the idea that the continents are slowly drifting further away from each other. Molten rock pushes up from the asthenosphere and pushes the plates apart at the mid ocean ridge. The lithosphere is made up of.

Sea floor spreading answer key. Seafloor spreading is happening at b. The continents are moving apart. A combination of the seafloor spreading theory and the continental drift theory.

For instance the atlantic ocean is believed to be expanding because of its few trenches. A theory that states the earth s crust is broken into plates that float on the asthenosphere. Hess believed that sea floor spreading is the answer to the mystery of continental drift. The earth s crust is one solid plate that is glued in place on top of the layers below.

The theory of seafloor spreading explains that earth s continents move because they ride atop ocean crust as it moves way from ocean ridges. The ocean floor has remained essentially unchanged since the formation of the earth. Due to this continuous seafloor spreading occurs and makes atlantic ocean floor to be connected to other continental crust making the ocean gets wider over the time. This creates new ocean crust.

What is the mechanism for sea floor spreading that heralded the advent of full blown plate tectonic theory. Geologist harry hess finally proved that wegener was right.