Which correctly describes why work is done when you lift a book a. a force is applied in a downward direction b. a force is applied in an upward direction c. a force is applied at an angle to the direction of motion.

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity