What would happen if there was no convection current in the mantle?
If Earth had no convective currents, that would mean the inner Earth has solidified, therefore, we would not have plate tectonics. Our Earth’s crust is made up of plates of varying sizes that move very slowly around the planet over time, this theory is called Plate Tectonics.
What is the main cause of convection currents in the mantle?
Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth.
How does gravity contribute to the convection cycle?
Some evidence suggests that gravity pulls the sinking plate down. The other reason for plate motion relates to convection currents within the upper part of the mantle. Convection is the heat-driven circulation of a fluid. In the mantle, heat from deeper in the Earth causes the overlying mantle to circulate.
How do convection currents play a role in the plate movement?
Convection currents drive the movement of Earth’s rigid tectonic plates in the planet’s fluid molten mantle. In places where convection currents rise up towards the crust’s surface, tectonic plates move away from each other in a process known as seafloor spreading (Fig. 7.21).
Why is convection not possible in solids for Class 7?
In the process of convection, molecules move from a hotter place to a colder region. Therefore, convection is impossible in solids because the molecules are rigid and vibrate when heated. In liquids and gases, molecules are comparatively less rigid and can move easily, thereby making convection possible in them.
Is convection possible in gases?
Convection is a type of heat transfer that can only happen in liquids and gases, because it involves those liquids or gases physically moving. Convection happens when there is a difference in temperature between two parts of a liquid or gas. The hot part of a fluid rises, and the cooler part sinks.
Why convection does not occur in solids and in vacuum?
Transfer of heat by convection cannot take place in solids because molecules in solids are fixed and cannot move about freely. Transfer of heat by convection cannot take place in a vacuum because there are no particles of any kind in a vacuum which can move and transfer heat.
Is convection is possible in vacuum?
Convection is the transfer of heat through the flow of fluids. Both liquids and gases can convect heat. But because space is a vacuum, there are no liquids or gases to convect heat away from the sun, all the way to Earth. So we can rule out convection.
Which is not possible in vacuum?
Conduction and convection are not possible in vacuum, they require medium, as in convection, heat transfer takes place only by motion of particles in the medium and in vacuum particles are not present. While radiation is possible in vacuum.
Which of the following is are examples of natural convection?
Everyday Examples of Convection radiator – A radiator puts warm air out at the top and draws in cooler air at the bottom. steaming cup of hot tea – The steam you see when drinking a cup of hot tea indicates that heat is being transferred into the air. ice melting – Ice melts because heat moves to the ice from the air.