what are three types of evidence for seafloor spreading

What Are Three Types Of Evidence For Seafloor 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. Where would you expect to find the oldest rock on the ocean floor? What is a deep-ocean trench?

What are the 3 evidences of 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 are the 4 evidences of seafloor spreading?

Evidence of Sea Floor Spreading. Harry Hess’s hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. This evidence was from the investigations of the molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes.

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What provides evidence of seafloor spreading?

The age of Earth’s oceanic crust can be presented to show the pattern of seafloor spreading at the global scale. Encyclopædia , Inc. Measurements of the thickness of marine sediments and absolute age determinations of such bottom material have provided additional evidence for seafloor spreading.

What are three kinds of evidence scientists have found to support this idea?

  • Molten Material (magma/lava) – scientists have found strange rocks shaped like pillows in the central valley of the ocean ridge. …
  • Magnetic Stripes – The molten rock contains iron – it is magnetic. …
  • Drilling Samples – the Glomar challenger drilled holes in the ocean 6km deep.

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.

What types of evidence best supports the theory of plate tectonics?

Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. Some life “rode” on diverging plates, became isolated, and evolved into new species.

Is fossil evidence of seafloor spreading?

Why are fossils found in ocean sediments no more than 180 million years old? … This “recycling” process, later named “seafloor spreading,” carries off older sediment and fossils, and moves the continents as new ocean crust spreads away from the ridges.

What is the major evidence that sea floor spreading creates new lithosphere?

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 evidence helped give strong support for the hypothesis of seafloor spreading at mid-ocean ridges?

This hypothesis was supported by several lines of evidence: (1) at or near the crest of the ridge, the rocks are very young, and they become progressively older away from the ridge crest; (2) the youngest rocks at the ridge crest always have present-day (normal) polarity; and (3) stripes of rock parallel to the ridge

How does seafloor spreading provide evidence of past plate motion?

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.

What 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.

Which statement describes the cyclic nature of seafloor spreading?

The Statements that describe the cyclic nature of seafloor spreading are as follows; New oceanic crust is formed.

When seafloor spreading occurs new crust is added to the ocean floor?

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.

Are there volcanoes at mid-ocean ridges?

The mid-ocean ridge is a continuous range of undersea volcanic mountains that encircles the globe almost entirely underwater. … The vast majority of volcanic activity on the planet occurs along the mid-ocean ridge, and it is the place where the crust of the Earth is born.

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Which statement describes one event that happens at deep ocean trenches?

The destruction of crust occurs at deep-sea trenches. Oceanic rocks are pillow-shaped when formed.

Which feature of Earth is created at mid-ocean ridges Brainly?

Explanation: Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the Earth’s tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.

What are the 3 types of boundaries?

There are three main types of plate boundaries:
  • Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust. …
  • Divergent boundaries – where two plates are moving apart. …
  • Transform boundaries – where plates slide passed each other.

Which of the evidence concerning seafloor spreading Do you believe best supports the theory?

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.

What evidence best supports continental drift?

Fossil Evidence

One type of evidence that strongly supported the Theory of Continental Drift is the fossil record. Fossils of similar types of plants and animals in rocks of a similar age have been found on the shores of different continents, suggesting that the continents were once joined.

How did Harry Hess discover seafloor spreading?

Hess discovered that the oceans were shallower in the middle and identified the presence of Mid Ocean Ridges, raised above the surrounding generally flat sea floor (abyssal plain) by as much as 1.5 km. … This created new seafloor which then spread away from the ridge in both directions.

What causes the seafloor to spread?

Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor. Eventually, the crust cracks.

What are the other evidences of continental drift theory?

The evidence for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones.

How do fossils help prove that the continents move quizlet?

the evidence that supported the hypothesis was that fossils of same animals and plants found on continents that were oceans apart. … fossils provide evidence for continental drift because there was fossils from the same animals and plants found on different continents.

Which of the following is the single best evidence in support of the concept of sea floor spreading?

Which is the best evidence supporting the concept of ocean floor spreading? … Oceanic crusts on both sides of the ridge shows matching patterns of reversed and normal magnetic polarity.

Which of the following is the single best evidence in support of the concept of seafloor spreading?

Evidence of Magnetic stripes

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It was the greatest support of sea fall spreading.

What are the three steps in the process of seafloor 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 is the order of seafloor spreading?

What are the steps of seafloor spreading in order from first to last? Answer: a crack forms, magma pushes upward, rock moves outward, magma hardens.

What is the first step in the seafloor spreading process Brainly?

Answer: Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.

Which is one piece of evidence of seafloor spreading fossil material?

Explanation: Eruptions of molten material, which results in continent material is a piece of evidence of seafloor spreading.

What statement most accurately describes the theory of seafloor spreading?

What statement most accurately describes the theory of seafloor spreading? a.Oceanic crust continuously forms across the seafloor and is moved by subduction zones toward mid-oceanic ridges where it is consumed.

Which statement accurately describes how magnetic stripes in ocean rock provide evidence of seafloor spreading?

Which statement accurately describes how magnetic stripes in ocean rock provide evidence of seafloor spreading? C.The pattern of magnetic strips shows that the seafloor is expanding at mid-ocean ridges.

How do ocean floor rocks and sediments provide evidence of seafloor spreading?

2. Explain how ocean-floor rocks and sediments are evidence of seafloor spreading. BOTH SEDIMENT THICKNESS AND THE AGES OF OCEAN-FLOOR ROCKS INCREASE WITH DISTANCE FROM THE RIDGE. THESE DATA ARE CONSISTENT WITH NEW CRUST FROMING AT RIDGES AND BEING DESTROYED AT TRENCHES.

What are the major ideas included in the seafloor spreading theory?

Seafloor spreading produces major characteristics of the seafloor – 1) the age of the seafloor is progressively older away from midocean ridges, 2) the elevation of the seafloor is progressively lower away from midocean ridges, 3) the magnetic history of the seafloor bears the striped-pattern of the Earth’s magnetic …

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