Sea Floor Spreading Diagram

This diagram provides evidence of seafloor spreading by showing the ages of ocean floor in the atlantic and eastern pacific oceans.

Sea floor spreading diagram.

Select the letter that is true about the mid ocean ridge. Sea floor spreading in the early 1960s princeton geologist harry hess proposed the hypothesis of sea floor spreading in which basaltic magma from the mantle rises to create new ocean floor at mid ocean ridges. The mid ocean ridge was mapped by sonar b. Start studying sea floor spreading 3 2.

Seafloor spreading is a process that occurs at mid ocean ridges where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. 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. The rifting processes coinciding with the onset of a new spreading centre typically start with an upwelling of hot mantle rocks under continental lithosphere the heat leading to uplift and associated erosion. Start studying section 4.

History of study earlier theories by alfred wegener and alexander du toit of continental drift postulated that continents in motion plowed through the fixed and immovable seafloor. The size of an ocean is determined by how fast is created at a mid ocean ridge. Sea floor spreading worksheet key ocean floor diagram quizlet diagram of the ocean floor model of sea floor spreading sea floor spreading worksheet whats people lookup in this blog. Schematic diagram showing the mechanism of seafloor spreading.

Lithosphere the crust plus the rigid upper mantle. The rising convectional currents continuously bang thick but strong oceanic sima crust and the hammering effect leads to the development of cracks joints fractures and disintegration of oceanic ridges. Magma molten rock withing the earth s mantle. Lower mantle semi rigid the deepest parts of the mantle just above the core.

Ocean floor diagram worksheet. Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor the mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate. Learn vocabulary terms and more with flashcards games and other study tools.