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An active volcano, such as in the Hawaiian islands, is a weak spot in the Earth's crust.
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∙ 15y ago
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∙ 8y agoits a volcano
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∙ 13y agoCracks, Faults, and Vents.
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∙ 14y agoA Volcano.
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∙ 9y agoa Volcano
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∙ 11y agohotspot
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∙ 9y agoA volcano.
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How do hotspots form in the mantle?
At a hot spot, the mantle directly beneath the crust is hotter than usual. This hot mantle material partially melts. The molten material, called magma, rises through the crust and erupts onto the surface for form volcanoes.
Why are the hawaiian islands in the middle of a plate?
There is a 'Hot-spot' in the mantle underneath the crust near the Hawaiian islands, it causes the magma to bubble up through fissures in the sea floor and eventually create new islands. this is how they were formed. for more info look at mantle convection.
What is the purpose for magma?
Magma is a product of earth processes. To say it has a purpose may be a subjective statement.**The first question this raises is: what exactly is this "material from the inside"? On our planet, it's magma, fluid molten rock. This material is partially liquid, partially solid and partially gaseous.magma production around plate boundaries. This interplatevolcanic activity is caused by unusually hot mantle material forming in the lower mantle and pushing up into the upper mantle. The mantle material, which forms a plume shape that is from 500 to 1000 km wide, wells up to create a hot spot under a particular point on the earth. Because of the unusual heat of this mantle material, it melts, forming magma just under the earth's crust. The hot spot itself is stationary; but as a continental plate moves over the spot, the magma will create a string of volcanoes, which die out once they move past the hot spot. The Hawaii volcanoes were created by such a hot spot, which appears to be at least 70 million years old.So what happens to the magma formed by these processes? We saw that the magma produced at ocean ridges just hardens to form new crust material, and so doesn't produce spewing land volcanoes. There are a few continental ridge areas, where the magma does spew out onto land; but most land volcanoes are produced by subduction zone volcanism and hot spot volcanism.When the solid rock changes form to a more liquid rock material, it becomes less dense than the surrounding solid rock. Because of this difference in density, the magma pushes upward with great force (for the same reason the helium in a balloon pushes up through the denser surrounding air and oil pushes upward through denser surrounding water). As it pushes up, its intense heat melts some more rock, adding to the magma mixture.The magma keeps moving through the crust unless its upward pressure is exceeded by the downward pressure of the surrounding solid rock. At this point, the magma collects in magma chambers below the surface of the earth. If the magma pressure rises to a high enough level,or a crack opens up in the crust, the molten rock will spew out at the earths surface.
A place where magma pushes up on oceanic lithosphere?
A volcano is a place where magma reaches the earths surface to become lava. Which comes out of an opening that is called a fissure.
A hot spot in the Earth's crust is often associated with?
Volcanos
What is an area where magma melts through the crust in the middle of a plate?
A hot spot is a place where material from the magma melts through the crust in a non plate boundary location.
What is a word that means a weak spot in the crust where magma comes to the surface?
In the crust the weak spot we have is the Magma Chamber. But, deep down to the mantle such weak zone is the Asthenosphere.
Is a caldera a weak spot in the crust where magma comes through?
No. A caldera is a depression formed from the collapse of a volcano during a violent eruption.False.
Why does magma in the mantle rise through the crust above it?
magma comes from the outer core and when an earthquake or something happends, a crack froms and the pressure of lava shoots up like a geyser.
What is an area where magma from deep within the mantle melts through the crust above?
Hot spot.
What is rising magma that maybe force its way through earth's crust not at a plate boundary?
hot spot
What is the definition for hot spot?
the weak spot in the crust where magma come to surface
What causes hot spot volcanoes form?
Magma from deep within the mantle melts through the crust which is what causes hot spot volcanoes to form
Where is a weak spot in the crust where magma has come to the surface?
A Volcano.
What is the weak spot in the crust where magma has to come up?
Volcano
Why do volcanoes form in certain regions of earth's surface?
A volcano is technically a weak spot in Earth's crust where molten material like magma reaches the surface. Magma is made near the surface by convergent (colliding) or divergent (spreading) boundaries. Most volcanoes form near convergent boundaries where the oceanic plate submerges because of the density of the plate.Also, a hot spot may form a volcano. A hot spot is where magma from the mantle reaches the surface. As the crust moves from convection currents in the mantle, the hot spot is near the crust. Whenever the hot spot passes under a weak spot in the crust, the pressure in the magma is strong enough to push through. As the crust continues moving, the hot spot makes different volcanoes in a row, called an island arc. An example of this is Hawaii.
What causes magma to flow out of a weak spot in the earths crust?
Geothermal presure.
