Layers of Rock

The Earth’s surface is made up of strata (layers) of rock that are like pages in a history book – the top layers are the newest pages, and the deeper you dig, the farther back in Earth’s history you travel. In this activity, you will watch the layers of rock build up over time to give us the strata we see today in the Grand Canyon. First, take a look at all the rock layers in the Grand Canyon, and notice the age of each layer. Then, move the slider to observe how the layers gradually accumulated on top of each other, with the newest layer coming last.