So the land in Canada and the northern Great Lakes is slowly rising, while the rest of North America is slowly sinking, like a seesaw, enabling the mantle to flow back north.

• 所以，加拿大的岛屿以及五大湖的北部将会慢慢的抬起，同时，北美其他的部分将会慢慢的下降，就像一个跷跷板，使得地幔向北抬起。