First global map of flow within the Earth’s mantle finds the surface is moving up and down “like a yo-yo”

Researchers have compiled the first global set of observations of flow within the Earth’s mantle – the layer between the crust and the core – and found that it is moving much faster than has been predicted. - See more at: http://www.cam.ac.uk/research/news/first-global-map-of-flow-within-the-earths-mantle-finds-the-surface-is-moving-up-and-down-like-a-yo#sthash.7pGQCSdk.dpuf