Seismic mapping of North America has revealed that an ancient slab of crust buried beneath the Midwest is causing the crust above it to "drip" and suck down rocks from across the continent.

North America is 'dripping' down into Earth's mantle, scientists discover

Source: space
Source Link: https://www.space.com/the-universe/earth/north-america-is-dripping-down-into-earths-mantle-scientists-discover