What Evidence In Rocks Supports The Theory Of Seafloor Spreading

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What Evidence In Rocks Supports The Theory Of 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 evidence supports the theory 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.

What evidence in rocks supports the theory of seafloor spreading quizlet?

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.

What are the three 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 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.

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 is the evidence for seafloor spreading quizlet?

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.

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 evidence do scientists use to support the continental drift theory?

Answer: 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.

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.

How do rocks along the central valley of the mid-ocean ridge provide evidence of sea floor spreading?

How do rocks along the central valley of the mid-ocean ridge provide evidence of sea-floor spreading? They provide evidence of seafloor spreading because the oldest rocks are the farthest away and the newer ones are the closest so they are the new floor pushing away the old rocks.

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

Evidence of Magnetic stripes

It was the greatest support of sea fall spreading.

How do rocks help support the theory of plate tectonics?

One of the key pieces of evidence supporting plate tectonic theory was the discovery that rocks on the seafloor record ancient reversals of the Earth’s magnetic field: as rocks are formed where plates are moving away from one another they record the current direction of the Earth’s magnetic field which flip-flops …

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 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.

What two additional categories of evidence supported the original seafloor spreading hypothesis?

Measurements of the thickness of marine sediments and absolute age determinations of such bottom material have provided additional evidence for seafloor spreading.

How do magnetic anomaly patterns on the ocean floor best serve as evidence for seafloor spreading?

magnetic polarity reversals. How do magnetic anomaly patterns on the ocean floor best serve as evidence for seafloor spreading? The symmetry on either side of mid-ocean ridges shows that new crust is created and then split apart.

What are the strongest evidence for 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.

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 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 evidence do scientists support?

Fossils provide solid evidence that organisms from the past are not the same as those found today and fossils show a progression of evolution. Scientists determine the age of fossils and categorize them from all over the world to determine when the organisms lived relative to each other.

What are 6 pieces of evidence that support continental drift?

The four pieces of evidence for the continental drift include continents fitting together like a puzzle scattering ancient fossils rocks mountain ranges and the old climatic zones’ locations.

How do distinctive rock strata support the theory of continental drift?

How do distinctive rock strata support the Theory of Continental Drift? Geologists have discovered distinctive patterns in rocks in continents that are now thousands of miles apart. By having matching patterns it indicates that the two continents and their rocks were at one time one continent.

What happens to old oceanic crust as new rock is formed during seafloor spreading?

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.

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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.

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 seafloor spreading support the continental drift theory?

Wegener proposed that the continents themselves move which is untrue. It is the tectonic plates that move. Sea floor spreading caused the break up of Pangea which prompted Wegener to add this in support of his continental drift theory.

Which observation about the Mid Atlantic Ridge region provides the best evidence that the seafloor has been spreading for millions of years?

Which observation about the Mid-Atlantic Ridge region provides the best evidence that the seafloor has been spreading for millions of years? The bedrock of the ridge and nearby seafloor is igneous rock.

What can you say about the ages of the oceanic rocks near the Mid Atlantic Ridge Do the ages of oceanic rocks get older as you move away from the ridge?

Answer: The newest thinnest crust on Earth is located near the center of mid-ocean ridge—the actual site of seafloor spreading. The age density and thickness of oceanic crust increases with distance from the mid-ocean ridge. … Eventually older oceanic crust encounters a tectonic boundary with continental crust.

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

What are the 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.

Which evidence best supports the occurrence of sea floor spreading at the Mid Atlantic Ridge?

Which evidence causes most scientists to believe that seafloor spreading occurs at the mid Atlantic ridge? Oceanic crusts on both sides of the ridge shows matching patterns of reversed and normal magnetic polarity.