North American continent is a layer cake, scientists discover

The North American continent is not one thick, rigid slab, but a layer cake of ancient, 3-billion-year-old rock on top of much newer material probably less than 1 billion years old, according to a new study by seismologists. The new findings also indicate that the continent grew by addition of rock from subducting ocean floor, not by mantle plume upwelling from below.

Read the whole article on Science Daily

More from Science Daily