What is recorded on newly formed oceanic crust spreading from mid-ocean ridge to create the magnetic stripes that form symmetric patterns parallel to the ridges?

What is recorded on newly formed oceanic crust spreading from mid-ocean ridge to create the magnetic stripes that form symmetric patterns parallel to the ridges?

At the mid-ocean ridge spreading axis, these flips in the direction of the Earth’s magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.

What occurs when one oceanic plate is forced down into the mantle beneath a second plate?

 A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. Denser oceanic slab sinks into the asthenosphere. Pockets of magma develop and rise. Continental volcanic arcs form in part by volcanic activity caused by the subduction of oceanic lithosphere beneath a continent.

Which type of tectonic plate boundary is found between the South American plate and the Scotia Plate?

The easterly edge is a divergent boundary with the African Plate; the southerly edge is a complex boundary with the Antarctic Plate, the Scotia Plate, and the Sandwich Plate; the westerly edge is a convergent boundary with the subducting Nazca Plate; and the northerly edge is a boundary with the Caribbean Plate and the …

When plates are diverging from each other for example at mid-ocean ridges are they?

Divergent Plate Boundaries Plates move apart at mid-ocean ridges where new seafloor forms. Between the two plates is a rift valley. Lava flows at the surface cool rapidly to become basalt, but deeper in the crust, magma cools more slowly to form gabbro.

How does the ocean floor preserve evidence of past magnetic reversals?

34) How does the ocean floor preserve evidence of past magnetic reversals? Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened. C) Isotopic analysis of ocean core sediments help determine sea floor age & this can be used to infer past magnetism.

How is oceanic crust formed?

Oceanic crust is constantly formed at mid-ocean ridges, where tectonic plates are tearing apart from each other. As magma that wells up from these rifts in Earth’s surface cools, it becomes young oceanic crust. The age and density of oceanic crust increases with distance from mid-ocean ridges.

What tectonic plates are oceanic?

An example of an oceanic plate is the Pacific Plate, which extends from the East Pacific Rise to the deep-sea trenches bordering the western part of the Pacific basin. A continental plate is exemplified by the North American Plate, which includes North America as well as the oceanic crust…

What type of plate boundary is located halfway between South America and Africa?

The Mid Atlantic Ridge, like other ocean ridge systems, has developed as a consequence of the divergent motion between the Eurasian and North American, and African and South American Plates.

What occurs when a rock melts due to decompression quizlet?

Most subduction-derived magma never reaches the surface. However, what is formed if this type of magma reaches the surface of a continent? What occurs when a rock melts due to decompression? Pressure has the opposite effect, compressing the solid, making it more resistant to melting.