How hot is it at the centre of the Earth? Read this book to find out! Books in this series take the reader on field trips to the most unlikely of destinations! In this title, get ready to drill down deep, as we go on a journey to the centre of the Earth! Our descent will take us through the layers that make up our planet: the crust, upper and lower mantle, outer core, and finally the inner core itself. But what will we find when we get there?