CAtaract
A mechanism for raising or lowering ships in a river that has rapids or waterfalls is called dam and lock system. It is a special kind of dam system.
A lock is the mechanism for raising and lowering ships in a river that has rapids or waterfalls. Locks are used to make navigation an easier task.
cataract
The Dalles
The Dalles
Waterfalls or river rapids
No, the Niger River does not have any major waterfalls. It flows through West Africa for about 2,600 miles before emptying into the Gulf of Guinea. The river landscape mainly consists of plains, valleys, and rapids rather than waterfalls.
A group of rapids and small waterfalls is commonly referred to as a "cataract." This term is often used to describe sections of a river where the water flows rapidly over rocks, creating turbulence and drops. Cataracts can vary in size and intensity, contributing to the river's overall landscape.
There are no waterfalls on the river Thames.
A mature river is on a shallower slope and it doesn't have rapids or waterfalls.(Waterfalls: steep fall of water, as of a stream, from a height.Rapids: part of a river where the current is swift.)
cataracts
three features of a youg river are rapids waterfalls and steep turns