What conditions must be present for a delta to form at the mouth of a river?
slow current, strong tides, river carrying a lot of sediment
slow current, weak tides, river carrying a lot of sediment
strong current, weak currents , river carrying a lot of sediment
In what course of the river are V-shaped valleys present?
Upper course
Middle course
Lower course
Where is the flow of water fastest in a meander?
The inside
The outside
The centre
What are the river landforms present in the middle course of a river?
Lateral erosion and deposition helps create meanders, oxbow lakes, floodplains and levees
Vertical erosion causes V-shaped valleys, interlocking spurs, gorges and waterfalls.
Floodplains, levees and meanders.
What is a plunge pool?
A pool of water formed by excessive rainfall.
A pool formed when water erodes backwards into an area of soft rock as water and rock swirl around.
Holes in cliffs formed when rain erodes the landscape.
Define interlocking spurs:
As the river erodes the landscape in the upper course, it winds and bends to avoid areas of hard rock. This creates interlocking spurs, which look a bit like the interlocking parts of a zip.
Small cliffs which the river cannot erode blocking the view up and down the valley. The cliffs serve as flood-protection.
Areas of impermeable soil which are distinctive within the landscape.
When a river runs over alternating layers of hard and soft rock what is created?
Oxbow lake
Waterfall
V-shaped valley
What features are created when a river erodes laterally creating large sweeping bends in the river channel?
Levees
Meanders
Oxbow lakes
When alluvium (silt) builds up on the banks of a river, what are formed?
deltas
Slipe-off slopes
levees
How many courses are rivers divided into?
5
4
3
