This image shows how magma moves through the Earth’s mantle. Which describes why the magma moves in the direction of the arrows?

The magma is cooled and becomes more dense by the core moving it toward the crust.
The magma is heated and becomes more dense by the core moving it toward the crust.
The magma is cooled and becomes less dense by the core moving it toward the crust.
The magma is heated and becomes less dense by the core moving it toward the crust.

D. The magma is heated and becomes less dense by the core moving it toward the crust.

Explanation:

Closer to the core of the earth is much hotter than near the crust so as the Lava heats up its particles move faster and father apart making it less dense, as the Lava from near the crust cools down it begins to get dense and sinks as the hot magma starts to move up.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.