What causes earths seasons, even though earth is always tilted the same way during its revolution around the sun.

The Earth's seasons are caused by the tilt of the axis and its revolution around the sun, Earth's tilt is always facing the same way, so when the earth is to left of the sun, the north is the coldest it can be, opposite effect if it is on the right.

Ibelieve that the correct answer is: c. along plate boundaries

Since the pully is a simple machine so the mechanical advantage is a 1