Hunks of oceanic crust are wedged inside Earth's mantle
Earth's middle layer is chunky, like peanuts in a sea of caramel.
Sarah Derouin is a science journalist based in Michigan. She has a doctorate in geology from the University of Cincinnati and is a graduate of the UC- Santa Cruz Science Communication program. Her work has appeared in Eos, Mongabay, Scientific American, and other news outlets. She is also an assistant producer on Big Picture Science radio show and podcast. You can follow her on Twitter @Sarah_Derouin.
