Gravity on the moon is about 1/6 th the gravity felt on the earth. this is because a) the moon is so far away from the earth. b) the moon is much less massive than the earth. c) the earth has a molten core and the moon doesn't. d) the moon is so much further from the sun than the earth.

The oldest rocks in the south atlantic ocean, immediately adjacent to the african and south american continental shelves, are 120,000,000 years old (time). calculate the average rate of seafloorspreading for the south atlantic ocean over its entire existence (hint: use formula: velocity = distance/time): /yr (velocity). now convert that to: cm/yr: