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The lithosphere (Earth's crust) is a hard, rigid plate on top of a softer molten layer known as the asthenosphere. Sounds like an Oreo to me! As a crude analogy that lets you bring food into the classroom, this lesson on plate boundaries sound like a winner. For an academic article on how to use Oreo's to teach about Earth's crust, see: http://dusk.geo.orst.edu/oceans/Oreo-Cookie.pdf
Via Seth Dixon
