A core component of the natural world is the geology, in the rocks and the landforms that have been created by their erosion. The plants that cover so much of the world's land areas, ant the myriad animals that inhabit each environment, form the wonderful world of nature, but the backdrops to all of them are the landscapes that are the world of geology. So many of the world's great natural attractions - the sites, the sights, the national parks, the...