Discussion
According to Strahlen's stream ordering when a stream of 2nd order joins 3rd order stream, the order of higher order stream will ...........
Answer: C
Under Strahler's ordering (printed 'Strahlen'), the higher order stream will remain same.
In Strahler's scheme the smallest fingertip streams are first order. A stream's order rises by one only where two streams of the same order meet: two first-order streams make a second-order stream, two second-order streams make a third-order stream. When a lower-order stream joins a higher-order one, the main stream keeps its order.
So a second-order stream joining a third-order stream leaves it third order. It does not increase (that needs another third-order stream), it can never decrease, and orders are not added together, which is how Shreve's magnitude, not Strahler's order, is calculated.
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