Answer:
The
streams within a drainage basin form certain patterns depending on the slope of
land, underlying rock structure as well as the climatic conditions of the area.
These patterns are known as drainage patterns.
The four patterns are
(i) Dendritic Pattern The river and its tributaries
follow
the slope of the terrain just like the branches of a tree.
(ii) Rectangular Pattern This occurs on a strongly jointed
rocky terrain.
(iii) Trellis Pattern This develops where hard and soft
rocks exist parallel to each other, so that the tributaries join the river at
almost right angles.
(iv) Radial Pattern This pattern develops when streams
flow in different directions from a central peak or dome like structure.
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