Simple Sea Floor Spreading Diagram

Start studying sea floor spreading 3 2.

Simple sea floor spreading diagram. 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. He suggested that new sea floor forms at the oceanic ridges and spread outwards from the line of origin. Learn more about sea floor spreading and how it works with this demo. In seafloor spreading.

This diagram provides evidence of seafloor spreading by showing the ages of ocean floor in the atlantic and eastern pacific oceans. The process begins when the crust is heated from beneath by upwelling in the mantle sometimes called a mantle plume. Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor. At ridges in the middle of oceans new oceanic crust is created.

The concept of sea floor spreading. The red colors are the youngest parts of the seafloor where fresh new crust is formed as lava seeps up from the deep interior of the earth at spreading ridges as new crust forms at these spreading ridges older crust colored green in the diagram moves away from. Further he claimed that continents would be pushed aside by the same forces that cause the ocean to grow. Lithosphere the crust plus the rigid upper mantle.

The concept of seafloor spreading was put forward by h harry hess an american geologist. See also continental drift a veritable legion of evidence supports the seafloor spreading hypothesis. The mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate the east pacific rise is a mid ocean ridge that runs through the eastern pacific ocean and separates the pacific plate from the north american. 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.

Seafloor spreading is a constant geologic phenomenon and a primary driver of continental drift. 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. Lower mantle semi rigid the deepest parts of the mantle just above the core. 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.

Free background music no copyright music brvtvs dead times freebackgroundmusic webs. Learn vocabulary terms and more with flashcards games and other study tools. The seafloor moves and carries continents with it. Magma molten rock withing the earth s mantle.