Convection currents occur in the MANTLE. The mantle is the second layer of the earth after the crust. The mantle is approximately 2900 km thick. Convection currents are triggered or fueled by the heat from the Earth's core.
The part of the mantle closest to the core gets heated. It then becomes less dense than the layers above so it rises. When this rising plume interacts with the crust it cools and becomes more dense than the layers below and so it sinks and this circular motion continues to form convection currents.
Answer:
4
Explanation:
The ongoing eruption, rated as VEI-4 on the Explosivity Index, was comparable to the event that occurred in 1902. Saint Lucia, Grenada, Antigua and Barbados all agreed to take in evacuees.
