What starts a convection current in the mantle? Question 8 options:

cold temperatures at the North Pole

material heating up in the mantle

heated liquids at the Earth's surface

Heat in the mantle comes from the Earth's molten outer core, decay of radioactive elements and, in the upper mantle, friction from descending tectonic plates.The temperature difference between the upper and lower boundaries of the mantle requires heat transfer to occur.

Material heating up in the mantle

the maximum mass of nh3 is nh3 in grams