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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