What is inside the Earth?

This is a great little video clip which demonstrates that we really do not know what is going on inside the mantle, but we are beginning to get an idea ... and crystals in igneous rock are, more importantly, very pretty!


Cross section through igneous rock crystals

John Maclennan from the University of Cambridge's Department of Earth Sciences explains all clearly in this slideshow with a commentry from the Beeb.

http://www.bbc.co.uk/news/science-environment-27678862