Why Doesn't the Earth's Crust Suffer From Hate-Sake From the Mantle?

The Earth's crust is 60 kilometres thick, thicker on land and thinner on the ocean. Underneath that you've got a ball of liquid iron and solid iron which provides heat. The average temperature of space is minus 270 something degrees centigrade. We don't have an episode of Science Next Week but we'll be back with you in a fortnight.