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~A river is a body of water flowing along a natural channel. It is a part of the watercycle.

Water evaporates from water bodies such as rivers, lakes and seas, and from plants and trees. The water vapour rises, cools and condenses to form clouds. Rain falls from the clouds . The rain water is intercepted by plants , seeps into the ground before reaching surface streams, or runs off the land surface into streams and rivers. The rivers enter lakes or seas. The water cycle is then repeated.

DRAINAGE BASINS 

A drainage basin (or catchment area) is an area of land which is drained by a river and its tributaries.
A watershed is the boundary separating one drainage basin from another. It usually follows the ridge or crest of a hill or mountain.
River starts at the source, flows along its course and ends or drains into a lake or sea.

DRAINAGE PATTERNS

Dendritic Pattern 
Can be found where the underlying rock is of the same type. The tributaries join the main river at acute angles and resembles the branches of a tree.
Trellis Pattern
Develop in an area where the rocks are made up of alternate bands of resistant and less resistant rocks, dipping in the same direction and lying at right angles to the main river valley.  Tributaries flow along the less resistant rocks and join the river at right angles.
Radial Pattern
Develop on volcanic cones or hills with rivers flowing out from a central high point in all directions.

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