Earth's History

The earth is about 4.6 billion years old. Since then many things have happened, including 5 extinctions, an explosion of life, and evolution within life. The first explosion of life, known as the Cambrian explosion, happened around 544 million years ago. Life was restricted to the ocean until it adapted to land 410 million years ago. One of the more major parts of its history was Pangea. Pangea was when all of today's continents were together as one continent 285 million years ago. Since then earth's tectonic plates have moved to their current positions. One of the later events was the widening variety of dinosaurs, mammals and birds. All of these events, and more, including the extinction of most of those dinosaurs, mammals, and birds, happened in the Cenozoic era, which we're currently in.

In our science class we had to do a scale timeline of Earths history. We decided to do the scale by a clock. Each hour represents 383,333,333 million years. Each section is a different color and although that we out the green section on the wrong side it is to scale.