Questions 10-12

                    The Mississippi River and its tributaries from the world´s fourth-longest rivers system.  Two Canadian

Provinces and all or parts of 31 states in the United States have rivers that drain into the Mississippi.  As the

Mississippi River flows down to join the sea, it deposits sand, silt, and clay, building the delta seaward across

Louisiana´s shallow continental shelf.  The delta marsh and its bays, lakes, and sound provide shelter and

nutrients for North America´s most fertile marine nursery

                10.It can be inferred from the passage that