Salt marshes may be formed behind a spit. The zone behind a spit becomes a sheltered area. Water movement slows down and so more material is deposited. Deposition may form a salt marsh.
Because waves can’t get past the spit, a sheltered area develops behind it. The water isn't moving much here, so it deposits sand and silt, so mud flats or salt marshes form. Spits can also form ...
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