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2007-01-05 04:11:12 · 2 answers · asked by rk 1 in Science & Mathematics Earth Sciences & Geology

2 answers

1. Agriculture
2. settlements and towns
3. transportation corridor

2007-01-06 22:13:10 · answer #1 · answered by luka d 5 · 0 0

They help drain the water to the rivers.

2007-01-05 08:09:50 · answer #2 · answered by JOHNNIE B 7 · 0 0

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