They also get to meet and interact with a real geologist, which makes them aware of this career opportunity. Samples of different rock types are collected from the watershed, placed around the relief map constructed earlier in the unit, and identified as to their collection locations and type. The relief map with rock samples is then displayed at a community event. Change occurs over time. Watersheds have been shaped over time.
Water is an important agent in shaping the earth's landforms.
The flow of water, erosion, and deposition cause many of the landforms we observe. Models are representations of objects or processes and are useful in studying things that are difficult to observe firsthand, such as things that are very large or very small, or events that occur over very long periods of time. Topographic maps, relief maps, and aerial photos can be used to study landforms. The structure and boundaries of a watershed can be identified on topographic maps, relief maps, and aerial photos. Cartographers are map-makers.