fossil, the preserved remains of traces of plants and animals, layer, a level of material that is different from that above or below it, form, to be made or shaped, delta, the part of the river near the river mouth where the water flow slows down, downstream, the direction the water flows, down toward the mouth of the river, river mouths, the part of the river where it flows into another body of water, river source, the place where a river starts, river bed, the ground at the bottom of the river, sculpt, to make something by carving, transportation, the process by which material is moved around the earths surface, upstream, the direction the water flows up, deposition, the dumping or depositing of material, flooding, when a lot of water covers the parts of the land not normally underwater, erosion, when broken pieces of rock are moved to another place, landscape, all of the features that can be seen in an area of land, sediment, natural material such as sand or soil, weathering, when rocks are broken down by weather, cause, The things that make something happen, effect, a change caused by something that happened, scale, the part that shows the relation between something's real size and its size on the map., glacial erratic, rocks that are carried by glaciers then deposited, glacial lake, an area of water that was created by a glacier, glacial striation, a scratch or groove in the land caused by a moving glacier, moraine, a pile of material left behind from a moving glacier, River plucking, when a glacier freezes onto pieces of rocks and pulls them away from the ground

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