Which of the following is true of the Mississippi River and New Orleans?
◦ The possibility of a sudden, major shift in the river's course now exists.
◦ New Orleans could become a "city without a river."
◦ Accumulation of sediments in the Mississippi Delta has caused portions of New Orleans to subside below sea level.
◦ All of these are true.
◦ New Orleans is subsiding, but there is no possibility that the Mississippi River could shift.