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:
(1) Less
Explanation:
Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.
Convection<span> in the solid mantle drives the many processes of plate tectonics, including the formation and movements of the continents and oceanic crust.</span>
Answer: Desertification
Explanation: Desertification means “the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.”
So it might also be deforestation. I hope that helps and I apologize in advance if I’m wrong.
Answer:
Spiral Galaxys are bright because they're full of gas and dust which are the ingredients to make new stars. When these new stars form they are very bright.
Explanation:
