When mantle rocks near the radioactive core are heated, they become less dense than the cooler, upper mantle rocks. These warmer rocks rise, while the cooler rocks sink. This movement of warmer and cooler mantle rocks creates pockets of circulation within the mantle called , which are thought to be the force behind the movement of tectonic plates over the asthenosphere.
A) magma flows
B) density cells
C) convection cells (currents)
D) conduction points
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C. Convection cells

Explanation:

Mantle convection is the moderate crawling movement of Earth's strong silicate mantle brought about by convection flows conveying heat from the inside to the planet's surface. Mantle convection, is a significant technique for heat transport inside the Earth. Mantle convection is the driving component for plate tectonics, which is the procedure eventually liable for delivering tremors, mountain ranges, and volcanoes on Earth. During the movement of warm and cooler mantle rocks, convention cells are created which acts as a pocket that creates force for the movement of tectonic plates.

b. is the answer hoped i        

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.