All of the air we breathe, the water we drink, the food we grow, the trees that give us shade, and the places we live, and visit are here on Earth. It feels like our planet has always been here. But have you ever wondered where it came from? How did it develop? What did the first living things look like, and how did they change with the ages of evolution? The newborn Earth was made of magma. You wouldn't have been able to live on...