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Grade 5 Science · World 1: Earth Shapers · Level 4
Deposition
Explain how dropped sediment builds deltas, sandbars, beaches, and sand dunes.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 4
- Whatever gets carried must land somewhere. Dropping sediment in a new place is called deposition.
- When a river reaches the sea, it slows down and drops its sediment. New land called a delta can build up.
- Wind drops sand too. When it hits a fence or a clump of grass, it slows and leaves a hill called a sand dune.
- Try it with a grown-up: in a tray of sand, pour a slow stream of water. Watch where it cuts, and where the sand lands.
Georgia Standards of Excellence in Science:
- S5E1.a — Construct an argument supported by scientific evidence to identify surface features (examples could include deltas, sand dunes, mountains, volcanoes) as being caused by constructive and/or destructive processes (examples could include deposition, weathering, erosion, and impact of organisms).