meander - a curve in a river, source - where a river starts, mouth - where a river meets a lake, sea or ocean, delta - where the river meets a lake, sea or ocean, tributary - a stream that joins a river, making it bigger, confluence - where two rivers join each other an become one, sediment - a solid material that is moved and deposited in a new place, deposition - the dropping off of sediment, erosion - the transporting of sediment, weathering - the breaking down of sediment, condensation - water vapour cooling down and becoming a liquid, evaporation - water heating up and becoming a gas, precipitation - water falling from the sky as rain, hail or snow, accumulation - water collecting in large bodies of water such as lakes and oceans, flood - an overflow of a large amount of water,

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