What are the 5 steps of sea floor spreading?
What are the steps in seafloor spreading?
- Magma comes out of the rift valley.
- Magma cools to rock and hardens.
- Rock is pushed away as new rock is formed at MOR.
- Oceanic crust and continental crust meet at the trench.
- Oceanic crust bends down under the continental crust.
- Gravity pulls rock towards mantle.
What is the result of sea floor spreading?
At subduction zones, the edge of the denser plate subducts, or slides, beneath the less-dense one. The denser lithospheric material then melts back into the Earth’s mantle. Seafloor spreading creates new crust. Subduction destroys old crust.
What are examples of evidence for sea floor spreading?
Several types of evidence supported Hess’s theory of sea-floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.
Which is the first step in the seafloor spreading process?
1. A long crack in the oceanic crust forms at a mid ocean ridge. 2. Molten material rises and erupts along the ridge.
What is the process of seafloor spreading and subduction?
Subduction occurs when two plates collide at a convergent boundary, and one plate is driven beneath the other, back into the Earth’s interior. … When an oceanic plate collides with a continental plate, the denser oceanic plate is bent downward and slides under the edge of the continent.
Is sea floor spreading constructive or destructive?
Sometimes, though, the results of seafloor spreading aren’t quite as destructive. Seafloor spreading can also lead to the creation of new geological features such as the Red Sea, which was created when the African and Arabian plate tore away from each other. Seafloor spreading can also drastically change sea levels.
What is sea floor spreading theory?
seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them.
What are three types of evidence for sea floor spreading?
What three types of evidence provided support for the theory of sea floor spreading? eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.
What are three features of the ocean floor?
Underwater landforms
- Continental shelf. Starting from land, a trip across an ocean basin along the seafloor would begin with crossing the continental shelf.
- Abyssal plains. Continuing your journey across the ocean basin, you would descend the steep continental slope to the abyssal plain.
- Mid-ocean ridge.
- Ocean trenches.
Which scientist proposed the idea of sea floor spreading?
Harry Hess
Harry Hess: One of the Discoverers of Seafloor Spreading.
What is the theory of seafloor spreading quizlet?
In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. As a result, the ocean floors move like conveyor belts, carrying the continents along with them.
What is the first step in the process of seafloor spreading?
https://www.youtube.com/watch?v=KHyG91v181E