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It moves away because the magma rises to the surface, and when it hits the water it instantly cools. This rock very slowly pushes the "older" rock to the side. This is called Sea Floor Spreading.
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∙ 13y ago
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∙ 14y agoThe Atlantic Ocean floor is separating all the time; it's driving the Americas further away from Eurasia and Africa at a rate of about an inch a year.
The separating plates form what's known as the Mid-Atlantic ridge; they can expose hot magma, leading to the formation of volcanoes. Most of these remain under the sea, creating hot vents called black smokers where undersea life can flourish; the most famous land-based example can be found on the island country of Iceland.
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∙ 13y agoas the plates pull apart, magma movrs to the serface, building ridges
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∙ 15y agoMagnetic reversals of the earths north and south poles occur and make the sea floor spread at the ridges.
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∙ 9y agoMid-ocean ridges cause the ocean floor to separate and grow. They are also known as spreading centers or divergent plate boundaries.
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∙ 15y agothe platonic plates on the sea floor, they move continants
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∙ 14y agoMagma piles up as it rises from the mantle.
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∙ 12y agothe sea floor spreads when the tectonic plates move on top of the lithosphere
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∙ 9y agone
Elisabeth Clark
New crust
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What is the evidence for sea-floor spreading?
at the mid-ocean ridge, molten material rises up from the mantel and spreads out, pushing the older rocks to both sides of the ridge.
When the seafloor spreads apart does hot saltwater move upward and flows from the cracks?
Who ever told you that the answer is yes, is steering you straight to hell! The answer is magma not saltwater!
What happens along a divergent boundary between two oceanic plates?
A rift valley, volcano, earthquake, trench.
How do magnetic bands provide evidence that tectonic plates are moving apart at mid-oceanic ridges?
Through seafloor-spreading as iron rich minerals cool they become magnetized in the direction parallel to the existing magnetic field. As the magnetic fields change direction so will the magnetized minerals, allowing scientists to record each change in the seafloor as it spreads.
How does the age of rocks in the seafloor provide evidence of seafloor spreading?
Rocks in the seafloor are moving one place to another
What are underwater mountains found at divergent plate boundaries were the seafloor spreads apart?
a underwater mountain
Does seafloor spreading hold the plates in place?
No, seafloor spreading does not hold the plates in place. Seafloor spreading is a process that occurs at mid-ocean ridges where new oceanic crust is formed and spreads apart. It is driven by the movement of tectonic plates, which are actually responsible for holding the seafloor in place.
How does seafloor spreading results in new oceanic crust?
As the seafloor spreads apart, magma from the mantle inside the earth bubbles up to the ocean and hardens in the cool temperatures, producing new oceanic crust
A Rift zone Underwater volcano?
Yes, also known as seafloor spreading! A rift zone volcano is called a mid-ocean ridge. The seafloor splits & spreads apart at a mid-ocean ridge, with lava seeping out of this fissure. The lava forms new seafloor. The older seafloor moves away from the ridge. Therefore, our ocean floor is actually spreading, at a rate of about two inches per year in the Atlantic ocean, and about 13 in the Pacific.
What is the evidence for sea-floor spreading?
at the mid-ocean ridge, molten material rises up from the mantel and spreads out, pushing the older rocks to both sides of the ridge.
Why do magnetic stripes appear on the sea?
The seafloor spreads apart, creating new rocks that record magnetic orientation. Small grains of magnetite on the volcanic basalt (ocean floor) have magnetic properties.
Why do magnetic stripes appear on the seefloor?
The seafloor spreads apart, creating new rocks that record magnetic orientation. Small grains of magnetite on the volcanic basalt (ocean floor) have magnetic properties.
How was Allan Cox contributing to the theory of continental drift?
Cox contributed to continental drift theory by researching and proving that the seafloor spreads and that the Earth has experienced magnetic reversals. He did this by studying the layers of volcanoes and streambeds.
How did the new evidence support Hess's theory of seafloor spreading?
Umm Maybe by the way sea floor spreads apart along both sieds of a mid ocean ridge as new crust is added
When the seafloor spreads apart does hot saltwater move upward and flows from the cracks?
Who ever told you that the answer is yes, is steering you straight to hell! The answer is magma not saltwater!
How did new evidence support Hess's theory of seafloor spreading?
Umm Maybe by the way sea floor spreads apart along both sieds of a mid ocean ridge as new crust is added
How a prediction and then evidence of magnetism in rocks on the ocean floor proved that the seafloor spreads?
The Earth's magnetic reversals have been recorded in newly forming oceanic seafloor basalt by the orientation of magnetic minerals which become frozen in place as the magma hardens. When the next reversal occurs, it as well becomes part of the ocean floor magnetic record.
