Earth is like a wobbling top spinning in space and the angular momentum keeps it pointing with the same orientation relative to its orbital plane over time. This spinning, however, is affected by numerous forces, including the gravitational tugs of the Moon and the Sun… and the distribution of the continents on the surface of the planet. Geologists have now found new evidence that the solid outer shell of the Earth may have shifted relative to its spin axis about 84 million years ago, causing the planet to wobble back and forth like a top. The new research suggests that the Earth tipped over significantly during the late Cretaceous period due to the distribution of mass on its surface and this could have implications for the evolution of life on Earth.