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What each cycle of spreading and intrusion of magma during seafloor spreading results in?
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∙ 10y ago
Taco.
Wiki User
∙ 10y ago
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Why did magnetic reversals on the seafloor support seafloor spreading?
Earth got its north and south Pole's have geographic and magnetic north and south poles which makes an angle of nearly 5.6degree. magnetic field created due to core of earth is reversed during each 100 million year period. ie.magnetic north becomes south and vice's. seafloor spreading is a continuous event so for each 100my spread seafloor we get opposite polarised magnetic substances. That is called magnetic reversal
About sea floor spreading?
Sea-floor spreading is what happens when the plates in the earth's crust move apart. During this movement of the plates, magma wells up from deep within the earth and fills in the cracks, forming a new oceanic crust, or sea-floor.
How does Leonardo da Vinci fit in this time period?
Leonardo da Vinci lived during the Renaissance, a time when individual thinking was spreading from florence to the rest of western Europe. Leonardo was able to become so well known because of idea that all men should have a voice during this time.
Why do you pass out during a tattoo?
It is a results of shock. Your body is being harmed by having foreign pigments injected into it. The body reacts by slowing blood flow to the brain, causing fainting.
How can ancient coral reef fossils can be found high in the mountains far from any sea?
Coral is lifted with the ancient seafloor during huge tectonic and volcanic events which literally push entire mountain ranges from below sea level to their present form. For instance, a good portion of the U.S. state of Northern California (in which I live) called the Sierra Nevada Mountains are a product of the very same upheaval event mentioned.
Each cycle of spreading and intrusion of magma during seafloor spreading results in?
isochron
When solid mantle rock rises during seafloor spreading magma is produced as a result of decompression melting?
Yes.
How is crustal rock heated inside the mantle?
Crustal rock is heated inside the mantle during divergent boundaries where new crust is generated as the plates pull away from each other. In mid-ocean, this movement results in seafloor spreading and the formation of ocean ridges; on continents, crustal spreading can form rift valleys.
Is the following sentence true or false when solid mantle rock rises during seafloor spreading magma is produced as a result of decompression melting?
true
Why did magnetic reversals on the seafloor support seafloor spreading?
Earth got its north and south Pole's have geographic and magnetic north and south poles which makes an angle of nearly 5.6degree. magnetic field created due to core of earth is reversed during each 100 million year period. ie.magnetic north becomes south and vice's. seafloor spreading is a continuous event so for each 100my spread seafloor we get opposite polarised magnetic substances. That is called magnetic reversal
What type of formation is a mid-oceanic ridge?
Its mostly a basaltic formation, caused as a result of ferromagnetic magmatic emergence at zones of seafloor spreading during oceanic-oceanic divergence.
During the intrusion of the Palisades Sill contact metamorphism changed sandstone and shale into what?
Hornfels
How does salt water intrusion affect power lines during Hurricane Sandy?
Salt water is corrosive.
What does the seafloor spreading theory states?
The theory of seafloor spreading was proposed by Harry H. Hess, an American geophysicist, in 1960. According to Hess, seafloor spreading is where two tectonic plates move apart and the ocean floor spreads out. When two tectonic plates spread apart they break. Magma then forces its way up through the cracks in an underwater volcano. When the magma hits the water, it cools and forms ridges along the plates that are pulling apart. In a normal volcano, the magma would pour down the sides and build up, but the since the plates are pulling apart underwater, the magma is more like forming a bridge. However, this bridge has valleys and mountains and is known as an oceanic ridge. The material being formed is known as constructive because a new ocean floor is actually being formed as a result of the process.
What happened during the red scare?
People panicked about the spreading of communism.
Which observation about the mid atlantic ridge region probides the best evidence that the seafloor has been spreading for millions of years?
The fact that there is a series of magnetic 'stripes' on either side of the ridge. They show that the earth's magnetic field has reversed several times during the formation of the rocks, and this only happened about every 5 million years. (There is some evidence that this is speeding up).
Why was sea floor spreading not known during wegeners lifetime?
There was a lack of technology.
