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Evidence of sea-floor spreading

Updated: 8/11/2023
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12y ago

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Other than abundant matching fossils and sedimentary rock on opposite sides of the Atlantic Ocean and the apparent puzzle piece appearance of the continents on either side of the Atlantic, there is the presence of the mid-oceanic ridges, areas where new oceanic crust is created. The magnetic orientation of the basaltic oceanic crust as it forms is the mirror image of the magnetic orientation of the basaltic oceanic crust on the other side of the ridge, indicating that the seafloor is spreading in both directions away from ridge. Additionally, the dating of rock on the ocean floor has shown that oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached.

And finally, accurate measurements have been made by global positioning devices which verify that seafloor spreading is occurring.

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11y ago
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12y ago

- Mountains are cause as the tectonic plates push into each other, mountain ranges such as the Himalayas are constantly 'growing' and becoming taller.

- Giant rift's are constantly being formed on the land and under the ocean, one which keeps getting bigger is located in East Africa (cant remember the name). Anothers is marianas trench wich is in the ocean.

- Volcanos and tsmunmis are also caused by sea floor spreading.

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Q: Evidence of sea-floor spreading
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Is there evidence that seafloor-spreading?

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What do magnetic anomalies provide evidence of?

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How does the age of rocks in the seafloor provide evidence of seafloor spreading?

Rocks in the seafloor are moving one place to another


How do the ages of the rocks on the seafloor support the theory of seafloor spreading?

The ages of the rocks become older the farther the way they are from the ridges. The closer they are the younger it is. This leaves evidence to the seafloor spreading theory.


Paleomagnetic evidence was used to confirm which of the following hypotheses?

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evidence from molten material evidence from magnetic stripes evidence from drilling samples


Magnetic striping is evidence of?

pole reversals seafloor spreading


What is one phenomenon that is considered evidence of seafloor spreading?

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How are magnetic patterns in sea floor rock evidence of seafloor spreading?

Magnetic alignment of rocks, in alternating strips that run parallel to ridges, indicates reversals in Earth's magnetic field and provides further evidence of seafloor spreading.


How did the seafloor drilling help scientist find evidence to support the seafloor-spreading hypothesis?

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What is the evidence of seafloor spreading?

Animal fossils have been found in many places in the ocean.