Part A: Younger Deposits
Active erosion wears away surface rocks while deposition piles loose sediments on top of existing surfaces. Over time loose sediments may be compacted and cemented, which forms sedimentary rocks. Younger rocks and sediments are also shown on the geologic map. Let’s look for evidence of young rocks and active deposition using the map and other tools.
Looking at Earth from space is inspiring. All of the colors you see in a satellite image tell you a lot about the world around us. What is on the land around you? Pavement? A grassy lawn? A forest? What covers our land matters because we depend on and pasture to produce food, forests for wood products, plants for clean air, and water to support wildlife.