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Why do mantle convection currents rise under mid ocean ridges?
Wiki User
∙ 11y ago
They don't.
The presence of magma at mid-ocean ridges is due to the effect of less pressure on the mantle below known as "decompressional melting".
Mantle rock is extremely hot, yet it remains in solid state because it is under immense pressure. At mid-ocean ridges, where tectonic plates are pulling apart, the crust is thinner, meaning less pressure on the mantle rocks below, thus they are able to melt, become less dense and rise.
Wiki User
∙ 11y ago
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How do the mantle's convection currents move to form a mid-ocean ridge?
The mantle's convection currents move in the mantle in the form of magma which creates the mid-ocean ridge. Mid-ocean ridges are found in every ocean in the world and when the currents erupt as lava the eventually cool and create a crust.
What is the general result of the motion of convection currents in the mantle beneath the Atlantic ocean?
The general result is to make the ocean basin wider.
What causes melting at mid-ocean ridges?
Mid-ocean ridges occur at diverging plate boundaries. Convection currents in the lower mantle pull the plates away from each other . As the plates move apart, lower mantle material is drawn toward Earth's surface. The rock of the lower mantle is hot, flexible, and solid. This rock is solid because of the great pressure of the layers above it. However, as the rock of the lower mantle rises, the pressure drops and the material melts.
Earth crust grows at mid ocean ridges why doesnt the earth grow larger?
At the opposite end of the convection current in the Earth's mantle that creates oceanic crust at the mid-ocean ridge, are trenches, where oceanic crust is diving down into the mantle. The Atlantic Ocean is expanding. The Pacific Ocean is shrinking.
Is it true that wind are examples of convection currents?
Not conduction, but convection currents, are what drive winds and many ocean currents.
How do the mantle's convection currents move to form a mid-ocean ridge?
The mantle's convection currents move in the mantle in the form of magma which creates the mid-ocean ridge. Mid-ocean ridges are found in every ocean in the world and when the currents erupt as lava the eventually cool and create a crust.
How are convection currents in the mantle and in the oceans similar How are they different?
The ocean currents are colder than the currents in the mantle,and the are located in different areas.
Where are 2 places in Earth that has convention currents?
The mantle and the ocean both have examples of convection currents.
What kinds of ocean currents might cause seafloor spreading?
Ocean currents have no effect whatsoever. Seafloor spreading is caused by convection currents in the rock of the earth's mantle.
Where do you find convection currents?
Convection currents occur in the asthenosphere.
What is the relationship between convection currents in the ocean and convection currents in the atmosphere?
Which best explains the relationship between ocean currents and convection currents?(1 point) Responses Convection currents join with the Coriolis effect to create the winds that drive ocean currents. Convection currents join with the Coriolis effect to create the winds that drive ocean currents. Ocean currents rely on warm convection currents to strength the Coriolis effect. Ocean currents rely on warm convection currents to strength the Coriolis effect. Ocean currents create a Coriolis effect that increases convection currents. Ocean currents create a Coriolis effect that increases convection currents. Convection currents use the Coriolis effect to generate ocean currents.
What is the general result of the motion of convection currents in the mantle beneath the Atlantic ocean?
The general result is to make the ocean basin wider.
What causes new material to form on the mid ocean ridges on the ocean floor?
The uplifted sea floor results from convection currents which rise in the mantle as magma at a linear weakness in the oceanic crust, and emerge as lava, creating new crust upon cooling.
Why are convection currents in the mantle?
The convection currents are a result of heat from the interior of the Earth. The rock of the upper mantle known as the asthenosphere is plastic-like but not molten. It acts like a conveyor belt, moving heat from Earth's interior upward, and cooled material downward in a big loop. New crust is created where mantle material reaches the surface at places called mid-ocean ridges. Older, colder oceanic crust is subducted and drawn into the mantle, completing the loop.
Where is a place where currents of heated mantle rock move towords earths surface?
Convection zones in areas of crustal formation like the mid-ocean ridges, or 'hot spots' like the one that created the Hawaiian Island chain.
What causes melting at mid-ocean ridges?
Mid-ocean ridges occur at diverging plate boundaries. Convection currents in the lower mantle pull the plates away from each other . As the plates move apart, lower mantle material is drawn toward Earth's surface. The rock of the lower mantle is hot, flexible, and solid. This rock is solid because of the great pressure of the layers above it. However, as the rock of the lower mantle rises, the pressure drops and the material melts.
How do you contrast mid-ocean ridges and trenches?
Mid-ocean ridges are the birthplace of oceanic crust. Trenches represent the destruction and burial of oceanic crust. They are at opposite ends of the Earth's convection currents that move through the asthenosphere.
