Answer:
A river along with its
tributaries is known as river pattern. Different river patterns have been
identified such as dendritic, radial and trellis and rectangular patterns. The
stream with its tributaries resembles the branches of a tree, thus it is known
as dendritic.
The radial pattern develops when
streams flow in different directions from a central peak. A river joined by its
tributaries, at approximately right angles, develops a trellis pattern. A
rectangular drainage pattern develops on a strongly jointed rocky terrain.
The following factors control them
(i) Slope of the land
(ii) Geological structure i.e.,
underlying rock structure
(iii) Climatic conditions of the
area. (3)
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