Labels:text | screenshot OCR: THE EARTH'S HISTORY THE NEWLY BORN EARTH was a semimolten ball of very hot material. While the heavier elements sank to the center to form a metal core, the lighter elements rose up to form the rocky mantle and crust. Over billions of years the planet cooled, the surface solidified, an atmosphere developed, and oceans formed. Today, the planet continues to evolve: the crust is renewed by volcanic eruptions on the ocean floors and is constantly changed by earthquakes and continental drift. THE YOUNG EARTH The proportions of different gases in As the Earth began to the atmosphere are also slowly cool, the conditions necessary changing due to human influence. for life as we know it started to appear. FACT FILE
