Rivers Key Words
Terms in this set (39)
Rocks and other particles carried along by the river (it's load) wear down the river bed and banks
Rocks being carried by the river smash and grind together, breaking into smaller, smoother and rounder particles as they move further along the river's course.
A point at which two or more rivers meet
A chemical process by which water dissolves minerals from the rocks/river bed and banks, washing them away.
A river delta is a depositional landform which is created as the river enters slower-moving water (e.g. where it enters an ocean, sea, estuary, lake, reservoir), so the sediments carried in the river water are deposited, as the river can no longer carry its load. They are found at the mouth of large rivers.
The area of land drained by a river and its tributaries
The wearing away of rock and soil found along the river bed and banks. It also involves the breaking down of the rock particles being carried downstream by the river. Includes hydraulic action, abrasion, attrition, solution.
An estuary is an area where a freshwater river or stream meets the ocean saltwater. This results in brackish water (which is somewhat salty, but not as salty as the ocean).
The area around a river that is covered in times of flood. It is a very fertile area due to the rich alluvium deposited by floodwaters (making floodplains a good place for agriculture).
A steep-sided, narrow rocky valley marking the retreat of a waterfall. Found in the upper course of a river
The force of the river water moving against the banks can cause air to be trapped in cracks and crevices. The pressure weakens the banks and gradually wears it away.
Hydroelectricity is the term referring to electricity generated by hydropower; the production of electrical power through the use of the gravitational force of falling or flowing water.
Forms when magma cools and solidifies, e.g. granite
Impermeable rocks do not allow water to pass through them, e.g. clay, granite
River embankment built by deposition as the river floods.
The section of the river near the sea, where deposition is the most important process and the valley becomes wider and flatter.
A bend in a river. The outside of the meander has the fastest flow and deepest water (thalweg)
Formed from other rocks that are changed because of heat or pressure
The section of the river between the mountains and the lowland, where transport of eroded material is important and the river begins to cut sideways due to the reducing gradient.
Where a river ends, at a lake or the sea.
A meander which has been cut off from the main river channel and abandoned.
Permeable rocks allow water to pass through them, e.g. chalk
The deep pool below a waterfall.
A rock is porous if it absorbs water (e.g. sandstone)
Found where the river meets a band of resistant rock and usually precede a waterfall.
A large natural or artificial lake used as a source of water supply
The portion of land drained by a river and its tributaries.
Erosional landform created on the outside of a meander bend by the erosive effect of fast-flowing water. Opposite to a slip off slope.
Larger material (e.g. pebbles) bounced along the bed of the river.
Formed by the build up of sediments over millions of years
Slip off slope (river beach)
The slip-off slope is a depositional landform on the inside bank of a meander on a river where sedimentary material is deposited as a result of the slower flow rate. It is the opposite landform to a river cliff.
Small particles of soluble rocks (e.g. limestone) slowly dissolve in the water
Where a river begins, usually in the mountains
The river transports very small and light material - usually fine clay and silt
The river moves material by saltation, traction or solution.
A smaller river that joins a larger one
Area of river closest to the source where gradients are steep and erosion rates are high
Form where the river meets a band of softer rock after flowing over an area of more resistant material. Waterfalls progressively cut back, leaving a gorge.
The level below which the ground is saturated with water.
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