Sea Floor Spreading Comic Strip

Several types of evidence supported hess s theory of sea floor spreading.

Sea floor spreading comic strip.

In the places where the plates are moving apart magma liquid rock moves up into the cracks and solidifies making a new ocean floor just like cake batter would ooze up through. See also continental drift a veritable legion of evidence supports the seafloor spreading hypothesis. This evidence led scientists to look again at wegener s hypothesis of continental drift. The concept of sea floor spreading.

In 1968 the glomar challenger a deep sea research vessel set out to collect drilling samples from around the world. Due to the invention of echo sounding the ocean floor began to be mapped. Spreading rates determine if the ridge is fast intermediate or slow. At ridges in the middle of oceans new oceanic crust is created.

Evidence for sea floor spreading. Further he claimed that continents would be pushed aside by the same forces that cause the ocean to grow. 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. Spreading rate is the rate at which an ocean basin widens due to seafloor spreading.

The oceanic crust is composed of rocks that move away from the ridge as new crust is being formed. The motivating force for seafloor spreading ridges is tectonic plate pull rather than magma pressure although there is typically significant magma activity at spreading ridges. Wherever continents are bordered by deep sea trench systems as in the pacific ocean the ocean floor is plunged downward underthrusting the continents and ultimately reentering and dissolving in earth s mantle from which it had originated. Sea floor spreading happens at places where plates are moving away from each other and where the liquid rock from the asthenosphere can come up to the lithosphere.

Students learn about seafloor spreading in class doing a paper strip model of divergent and convergent plate boundaries. The mid ocean ridge is the region where new oceanic crust is created. He suggested that new sea floor forms at the oceanic ridges and spread outwards from the line of origin. Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor.

The process of sea floor spreading. The concept of seafloor spreading was put forward by h harry hess an american geologist. Eruptions of molten material magnetic stripes in the rock of the ocean floor and the ages of the rocks themselves. The seafloor moves and carries continents with it.

The formation of the new crust is due to the rising of the molten material magma from the mantle by convection current. They found that the ocean floor was not flat as previously expected.