Drag the missing word into place Over thousands and thousands of years, these rocks were buried under younger rocks in accordance with the law of

superposition. This geological principle states that in an undisturbed sequence of sedimentary rocks, the oldest layers are at the bottom and the younger layers are at the top. So, if you ever find yourself standing on a layer of ancient rock, you're quite literally walking on history — how cool is that? In practical terms, this concept helps geologists date rock layers and understand Earth's geological history. By studying these layers, they can uncover information about past environments, climate changes, and even the evolution of life. Next time you're hiking in the mountains or exploring a canyon, look at those rock layers and remember, you're witnessing a timeline of Earth's story!