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Is it true molten material in the asthenosphere rises in convection currents because heated materials become more dense?
Wiki User
∙ 6y ago
Actually, hot, less dense material rises, and cold, denser material sinks. Denser material will be heavier (per unit volume) and gravity therefore pulls it down. Less dense material has buoyancy and rises. It's very logical.
Wiki User
∙ 9y ago
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Differences in a material's is what drives convection?
Differences in a materials __________ is what drives convection
Does gravity play a role in plate movement?
From what I know, Geologists have two main theories on why plates move. -The First idea is that at converging plate margins (constructive) as material moves up, the plates are pushed outwards -The second idea is that convection currents within the asthenosphere, (below the plates) which push plates along as if they were on wheels. These currents are formed as partially melted rocks rise because they are heated because it is hotter closer to the core and hotter materials rise. However, after rising for a while, the material cools and drops down again. This forms circular movements of rock which push the plates along. According to these theories, gravity doesn't but there might be another theory which says otherwise.
What temperature and density changes and occur in convection cells of a fluid or plastic material?
What causes these plates to move? The important thing to remember is that heat flows from warm areas to cool areas. In the asthenosphere you have some areas that are hotter than others. When the cool areas are heated up, their density decreases and they rise. Eventually, they cool, sink and repeat the process all over again. The result is a circular motion or current in the flowing part of the mantle. This process is called convection. Convection is also responsible for currents in the air.Hot air (a gas) rises near the equator and flows toward the poles, where it cools, becomes denser and sinks.
What is the movement of material caused by the interaction between warm and cool material?
Convection Current
What are modern materials?
A modern material is a material is a material made on the last 50 years.
What is Circular movement of material inside Earth's mantle called?
What happens in the asthenosphere (part of the mantle) is called convection currents
What is the relatively soft layer of rock below the lithosphere?
The softer layer below the lithosphere is the asthenosphere. The asthenosphere begins at a depth of approximately 150 km. It has convection currents that arise from the heating and subsequent rising of material from the lower asthenosphere. These convection currents drive the movement of lithospheric plates at the surface, and are the cause of tectonic activity.
Does mantle material rise in convection currents because heated materials become more dense?
no
One hypothesis states that plate movements results from convection currents in the?
Earth's mantle. These convection currents are driven by heat from the Earth's core, which causes material in the mantle to become less dense and rise, and denser material to sink. This movement of the mantle material pushes and drags the tectonic plates along with it.
Why do convection currents sink back to the core?
Because there are deep-ocean trenches which are deep under water canyons.
What causes covection currents?
Well, i don't know what causes them but i do know how they form.Convection currents are formed somewhere in the upper mantle below the asthenosphere and is called the mesosphere.the mantle material,(the hotter material) rises on the surface of the asthenosphere,and pushes the cooler material out of the way,sinking back into the Earth becoming more and less dense each time. Hope this helped! :)
Surface currents are set in motion by the?
convection currents are set into motion by heat.without heat the convection currents would stop when all the material reaches the same temperature.
What direction do convection currents move?
Warmer material in a convection current rises upwards.
Differences in a material's is what drives convection?
Differences in a materials __________ is what drives convection
How are convection currents important in the Earth's system?
Deep, cold-water currents play an important role in creating the ocean oasis of the film. Convection currents play a role in the circulation of fluids. Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks.
What is a convection current caused by?
The liquid or gas which transfers the heat can circulate round and round between the hot and cold regions. The flow of liquid or gas is called a convection current. Convection currents are caused by changes in density.
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.
