Answer
They have increased fertility.
Work Step by Step
This is because rivers which carry various nutrient rich sediment deposits in flood plains, which make them more fertile regions.
Environmental Science for AP* (2nd Edition)
by Friedland, Andrew J.; Relyea, Rick
Published by
W. H. Freeman
ISBN 10:
1464108684
ISBN 13:
978-1-46410-868-6
Chapter 9 - Module 26 - The Availability of Water - AP Review Questions - Page 301: 3
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