Where are convection currents rising?
Where are convection currents rising?
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).
How do convection currents in the mantle rise?
Heat rising and falling inside the mantle creates convection currents generated by radioactive decay in the core. The convection currents move the plates. Where convection currents diverge near the Earth’s crust, plates move apart. Where convection currents converge, plates move towards each other.
Where are the convection currents located in the mantle?
Convection currents in the magma drive plate tectonics. Heat generated from the radioactive decay of elements deep in the interior of the Earth creates magma (molten rock) in the aesthenosphere. The aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the Earth that extends to 2900 km.
Do convection currents occur in the upper or lower mantle?
The common, simplified explanation for why tectonic plates are moving is that they’re carried along on currents in the upper mantle, the slowly flowing layer of rock just below the Earth’s crust. Converging currents drive plates into each other.
How are convection currents set up in air?
Answer: The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas. The denser cold liquid or gas falls into the warm areas. In this way, convection currents that transfer heat from place to place are set up.
Where do convection currents take place is it in the lithosphere or the asthenosphere?
Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust. Convection currents also stress the lithosphere above, and the cracking that often results manifests as earthquakes.
Where does convection occur?
Convection occurs on a large scale in atmospheres, oceans, planetary mantles, and it provides the mechanism of heat transfer for a large fraction of the outermost interiors of our sun and all stars. Fluid movement during convection may be invisibly slow, or it may be obvious and rapid, as in a hurricane.
At which location do the convection currents cause the plates to diverge?
At which location do the convection currents cause the plates to diverge? folded mountains.
Which event is part of a convection current in the air?
Convection currents are present in the air– A good example of convection current is the warm air that rises towards the ceiling in your house. The process happens as the warm air is said to be less dense than that of the colder air. Another good example of convection current is wind.
Which layer of Earth contains the convection currents?
The two layers of the Earth that are involved in forming convection currents are the mantle and the outer core. b. Convection currents in the mantle are caused by the heat coming from the core and also the mantle.
What is the direction of movement of convection current?
Answer: Solution: By the process of convection, heat is always transferred vertically upwards. This happens because the medium particles near the source of heat absorb heat from the source and they start moving faster.
