The Earth is pretty old. Our current, best estimate is that it is 4.54 billion years old, plus or minus 50 million years. Since then, however, a lot has happened. To help clarify the Earth’s timeline, geologists have divided the Earth’s history into various eras and periods. Each division of time represents a change in something, which happened on the planet. Learn more about the Earth’s history and geologic time scales, on this episode of Everything Everywhere Daily. Learn more about your ad choices. Visit megaphone.fm/adchoices