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Chapter 5 - Erosion & Deposition - 6th Grade Science

erosionThe process by which water, ice, wind, or gravity moves fragments of rock and soil.
sedimentSmall, solid particles of material from rocks or organisms which are moved by water or wind, resulting in erosion and deposition.
depositionThe process by which sediment settles out of the water or wind that is carrying it, and is deposited in a new location.
Weathering, erosion, and deposition act together in a cycle thatwears down and builds up Earth’s surface.
Gravity is the force thatmoves rock and other materials downhill.
mass movementAny one of several processes by which gravity moves sediment downhill
The different types of mass movement includelandslides, mudslides, slump, and creep.
Moving water is the major agent oferosion that has shaped Earth’s land surface.
runoffWater that flows over the ground surface rather than soaking into the ground.
rillA tiny groove in soil made by flowing water.
gullyA large channel in soil formed by erosion.
streamA channel through which water is continually flowing downhill.
riverA large stream.
tributaryA stream that flows into a larger stream.
drainage basinThe land area from which a river and its tributaries collect their water.
divideA ridge of land that separates one drainage basin or watershed from another.
Through erosion, a river createsvalleys, waterfalls, flood plains, meanders, and oxbow lakes.
flood plainA broad, flat valley through which a river flows.
meanderA looping curve formed in a river as it winds through its flood plain.
oxbow lakeThe crescent-shaped, cutoff body of water that remains after a river carves a new channel.
Deposition creates landforms such asalluvial fans and deltas. It can also add soil to a river’s flood plain.
alluvial fansA wide, sloping deposit of sediment formed where a stream leaves a mountain range.
deltaA landform made of sediment that is deposited where a river flows into an ocean or lake.
groundwaterWater that fills the cracks and pores in underground soil and rock layers.
stalactiteA calcite deposit that hangs from the roof of a cave.
stalagmiteA cone-shaped calcite deposit that builds up from the floor of a cave.
karst topographyA type of landscape in rainy regions where there is limestone near the surface, characterized by caverns, sinkholes, and valleys.

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