Rock History of Earth

Earth’s history is written in its rocks. When we look at a canyon like the Grand Canyon, we see almost two billion years of Earth’s past revealed in its rock layers. We also see how over millions of years, water can change the rocky landscape. And when we dig deep into each of the rocky layers, we find fossils – traces of living things that existed on Earth long ago. In these activities, we will explore how water carves out rock, how rock layers slowly accumulate, and what we can learn from the rock layers and fossils found in them.