In the diagram of earths interior, which part drives movements of the plates?

1)c
2)a
3)d
4)b

The answer is 1 – C. This region of the earth is called the mantle. This region is composed of ‘plastic’ rock. The plasticity is due to the fact that the temperatures are high enough to make the rocks liquid but they remain solid because of the high pressure in the region. The convection currents of the mantle are responsible for dragging along the continental plates of the earth’s crust, hence the tectonic movements.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)