What Is Seafloor Spreading And Where Does It Occur
Magma is a very important part in seafloor spreading.
What is seafloor spreading and where does it occur. This is powerful evidence that seafloor spreading does in fact occur. Magnetic reversal proves seafloor spreading because we can see the polarity of the earths magnetic field in rocks. As magma cools particles in it get frozen in the direction of the magnetic field. When seafloor spreading occurs it pushes the underground magma up though the new crust creating a sort of volcano out of the new crust.
Start studying sea floor spreading. The magnetism of mid ocean ridges helped scientists first identify the process of seafloor spreading in the early 20th century. When oceanic plates diverge tensional stress causes fractures to occur in the lithosphere. The motivating force for seafloor spreading ridges is tectonic plate slab pull at subduction zones rather than magma pressure although there is typically significant magma activity at spreading ridges.
Basalt the once molten rock that makes up most new oceanic crust is a fairly magnetic substance and scientists began using magnetometers to measure the magnetism of the ocean floor in the 1950s. Sea floor spreading takes place at the mid ocean ridge where two oceanic plates are spreadingpulling apart from one another. Spreading is generally thought of when speaking of sea floor spreading. Seafloor spreading is a geologic process where there is a gradual addition of new oceanic crust in the ocean floor through a volcanic activity while moving the older rocks away from the mid oceanic ridge.
As magma cools particles in it get frozen in the direction of the magnetic field. When seafloor spreading occurs it pushes the underground magma up though the new crust creating a sort of volcano out of the new crust. Learn vocabulary terms and more with flashcards games and other study tools. This is powerful evidence that seafloor spreading does in fact occur.
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