What Is The Major Evidence That Sea-Floor Spreading Creates New Lithosphere? Explain Your Answer.

What Is The Major Evidence That Sea-floor Spreading Creates New Lithosphere? Explain Your Answer.?

The record of magnetic reversals is carried away from each side of the spreading center of a mid-ocean ridge showing that the molten rock is creating new lithosphere.

What is the major evidence that seafloor spreading?

Abundant evidence supports the major contentions of the seafloor-spreading theory. First samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached and the sediment cover is thinner near the ridge.

How does seafloor spreading affect the lithosphere?

The denser lithospheric material then melts back into the Earth’s mantle. Seafloor spreading creates new crust. Subduction destroys old crust. The two forces roughly balance each other so the shape and diameter of the Earth remain constant.

What is seafloor spreading and how is it evidence of plate movement?

Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge tensional stress causes fractures to occur in the lithosphere. … At a spreading center basaltic magma rises up the fractures and cools on the ocean floor to form new seabed.

How new lithosphere is produced by the sea floor spreading that occurs at a mid-ocean ridge?

Seafloor spreading is the process by which new oceanic lithosphere forms at mid-ocean ridges. As tectonic plates move away from each other magma rises from Earth’s interior. It then cools and solidifies in the center of the ridge. The rising magma pushes up between the plates and drives them further apart.

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What are the 3 types of evidence for seafloor spreading?

Several types of evidence from the oceans supported Hess’s theory of sea-floor spreading-evidence from molten material magnetic stripes and drilling samples.

What makes up the lithosphere?

The lithosphere is the rocky outer part of the Earth. It is made up of the brittle crust and the top part of the upper mantle. The lithosphere is the coolest and most rigid part of the Earth.

What is 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.

How do ocean ridges and deep sea trenches support the theory of seafloor spreading?


How was sea floor spreading tested as a hypothesis?

Since the oldest oceanic crust was found at the edges of the trenches Hess hypothesized that the seafloor subducts into Earth’s interior at the trenches to be recycled in the mantle. As oceanic crust forms and spreads moving away from the ridge crest it pushes the continent away from the ridge axis.

What evidence was presented by geologists in the 1960s that sea floor spreading actually takes place?

In particular four major scientific developments spurred the formulation of the plate-tectonics theory: (1) demonstration of the ruggedness and youth of the ocean floor (2) confirmation of repeated reversals of the Earth magnetic field in the geologic past (3) emergence of the seafloor-spreading hypothesis and

What is evidence of seafloor spreading Brainly?

One piece of evidence of seafloor spreading is a mid-ocean ridge. Explanation: The Mid-Atlantic Ridge is a mountain system formed by plate tectonics on the seafloor.

How does Earth magnetic field provide evidence for seafloor spreading?

A polarity reversal means that the magnetic North flips to where we know the South Pole is. … This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges. These patterns of stripes provide the history of seafloor spreading.

How do magnetic reversals provide evidence of the seafloor spreading?

Magnetic reversals occur every so often. When they happen the Earth’s magnetic field reverses its polarity. In other words north becomes south and south becomes north. Magnetic reversal proves seafloor spreading because we can see the polarity of the Earth’s magnetic field in rocks.

What causes seafloor spreading?

Seafloor spreading creates new oceanic crust at a mid-ocean ridge. When this new material reaches the end of the plate and comes into contact with another plate whether continental or not a convergent or a transform boundary will occur.

What is the major difference between lithosphere under a continent compared to under the ocean floor?

Layers that are less dense such as the crust float on layers that are denser such as the mantle. Both oceanic crust and continental crust are less dense than the mantle but oceanic crust is denser than continental crust. This is partly why the continents are at a higher elevation than the ocean floor.

How is lithosphere formed Wikipedia?

When a continental plate comes together with an oceanic plate at a subduction zones the oceanic lithosphere always sinks beneath the continental. New oceanic lithosphere is constantly being produced at mid-ocean ridges and is recycled back to the mantle at subduction zones.

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What is lithosphere in short answer?

Lithosphere is the solid crust or the hard top layer of the earth. It is made up of rocks and minerals. It is covered by a thin layer of soil. It is an irregular surface with various landforms such as mountains plateaus desert plains valleys etc.

What makes up the lithosphere Brainly answer?

Answer: The lithosphere is the solid outer part of the Earth. The lithosphere includes the brittle upper portion of the mantle and the crust the outermost layers of Earth’s structure. It is bounded by the atmosphere above and the asthenosphere (another part of the upper mantle) below.

What are the steps in the process of sea-floor spreading?

Terms in this set (7)
  1. Magma comes out of the rift valley.
  2. Magma cools to rock and hardens.
  3. Rock is pushed away as new rock is formed at MOR.
  4. Oceanic crust and continental crust meet at the trench.
  5. Oceanic crust bends down under the continental crust.
  6. Gravity pulls rock towards mantle.
  7. Rock melts to mantle.

What evidence further supports the theory of seafloor spreading quizlet?

Evidence from molten material magnetic strips and drilling samples support the theory of sea-floor spreading.

What causes seafloor spreading quizlet?

During sea-floor spreading magma erupts along a mid-ocean ridge to form new oceanic lithosphere. The floor then moves away from the ridge often toward a trench at the edge of the ocean basin. … The pattern shows that ocean floor forms along mid-ocean ridges and then moves away from the ridge.

How do ocean floor features support the theory of plate tectonics?

New crust can be observed being formed on the sea floor ridges. … These observations support the idea that the plates are spreading apart along the ocean ridges. Matching magnetic lines of reversal along both sides of the ocean ridge also lends support to the theory of sea floor spreading.

What structures on the ocean floor provide evidence of plate tectonics?

These large structures include deep trenches and long ridges where new material is added to the seafloor. These features can be successfully modeled with plate tectonics. The dramatically deep trenches in the ocean floor can be modeled with convergent boundaries of plates.

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Seafloor Spreading

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