Which best explains mantle convection? (1 point) O Cooler material in the mantle moves down, and warmer material in the mantle moves up.
O Warmer material in the mantle moves down, and cooler material in the mantle moves up.
O Warmer and cooler material in the mantle move down.
O Warmer and cooler material in the mantle move up.

A. Cooler material in the mantel moves down, and warmer material in the mantle moves up.

Explanation:

Heat always rises due to being lighter because the atoms in the material is spread out, while cold goes down due to being heavier because the atoms in the material is more compact.

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.