The blue sphere we call home is a truly fascinating planet, not least because of the life it gave rise to. Beauty and awe are everywhere, from the white mantle of the poles, to the creamy dunes of the Sahara desert, from the lushness of life in its jungles and the evergreen of its forests to the cleansing deep of its oceans and rivers. The Earth delights the senses, gives life with her generosity and provides a home for all creatures. There's a reason Louis Armstrong chose to celebrate the Earth in his now classic What a Wonderful World, and all you have to do is take a look around you. Here are some facts about our 4.5 billion year old Earth.