what evidence supports seafloor spreading

What Evidence Supports 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.

What are 3 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.

What is the evidence of the 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.

What are 2 pieces of evidence supporting 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. This evidence also led sci- entists to look again at Wegener’s theory of continental drift.

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 …

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.

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What supports Hess’s theory of 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 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.

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 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 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.

Which is the best evidence supporting the concept of ocean 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 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 5 evidence that supports the theory of plate tectonics?

There is variety of evidence that supports the claims that plate tectonics accounts for (1) the distribution of fossils on different continents, (2) the occurrence of earthquakes, and (3) continental and ocean floor features including mountains, volcanoes, faults, and trenches.

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.

What observations about landforms best supports the theory of plate tectonics?

Which of the following observations about landforms best supports the theory of plate tectonics? Impact craters have been found both on dry land and on the ocean floor. As lava cools on Earth’s surface, it forms a variety of igneous rocks. Volcanoes are distributed randomly on every continent.

How does Earth’s 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 strips of iron in ocean rock provide evidence of seafloor spreading?

How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading? … They show how the density of the seafloor has changed. They reveal a matching pattern on either side of the ridge. They reveal differences in the mineral composition of newly created rock.

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.

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.

Which temperature most likely corresponds to the asthenosphere?

The lithosphere-asthenosphere boundary is conventionally taken at the 1300 °C isotherm. Below this temperature (closer to the surface) the mantle behaves rigidly; above this temperature (deeper below the surface) it acts in a ductile fashion.

Who proved that the seafloor is spreading?

Harry H. Hess

The seafloor spreading hypothesis was proposed by the American geophysicist Harry H. Hess in 1960.

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

How do ocean ridges and deep-sea trenches support the theory of seafloor spreading? THE THEORY OF SEAFLOOR SPREADING STATES THAT OCEAN RIDGES ARE PLACES WHERE NEW OCEAN CRUST IS FORMED; TRENCHES ARE PLACES WHERE IT IS DESTROYED. … THESE DATA ARE CONSISTENT WITH NEW CRUST FROMING AT RIDGES AND BEING DESTROYED AT TRENCHES.

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.

How do sedimentary cores from the ocean floor support the concept of seafloor spreading?

How do sediment cores from the ocean floor support the concept of seafloor spreading? … They found lateral symmetry in magnetic patterns on either side of mid-ocean ridges, showing that these separated stripes were formed at the same time at the mid-ocean ridges.

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.

Does seafloor spreading add new material to the ocean floor?

The process that continually adds new material to the ocean floor is – called Sea floor spreading. … The process by which the ocean floor sinks into the mantle is called Subduction ..

What is a device that scientists use to map the ocean floor?

Dive and Discover : Oceanographic Tools: Sonar. Echo sounding is the key method scientists use to map the seafloor today. The technique, first used by German scientists in the early 20th century, uses sound waves bounced off the ocean bottom.

How does the age of oceanic rock serve as evidence for seafloor spreading?

The age, density, and thickness of oceanic crust increases with distance from the mid-ocean ridge. The magnetism of mid-ocean ridges helped scientists first identify the process of seafloor spreading in the early 20th century. … Oceanic crust slowly moves away from mid-ocean ridges and sites of seafloor spreading.