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They then pour water into the river bed by means of a spout. They watch because the water enters the stream mattress and begins to carry away sand from the stream edges and the underside. They may pour water into a coffee can. Record their answers on a flipchart which you can confer with all through the investigation. Have your students share their ideas with the category and document them as a list on the flipchart. Have your college students talk about these questions, first in pairs, then groups after which as an entire class. Have your college students focus on the query in pairs, then in teams, and then as a whole class. Students who stay near major rives may have had some experiences with the erosion of sediment on account of flooding. Many students have stood on the financial institution of a stream or river and watched its water flowing. What does the water flowing in a river or stream do to the rock or soil that surrounds the river? Abrasion occurs as sediment in a stream collides with rock in and along the stream. Over a long time, stream abrasion can cause great modifications in the form of a stream or river and Earth’s floor. The bedrock beneath streams can also be eroded by abrasion.