Here's why:
* River Deposition: Rivers carry sediment (sand, silt, clay) downstream. As the river reaches its mouth, the water slows down, causing the sediment to settle.
* Saltwater Influence: At the river's mouth, the freshwater mixes with saltwater from the ocean or sea. This creates a brackish environment.
* Salt Marsh Formation: The deposited sediment, combined with the brackish water, creates a unique habitat known as a salt marsh. Salt-tolerant plants, like grasses and rushes, thrive in this environment.
It's important to note that while salt is a component of the environment, it's not the primary material deposited to form the land itself. It's the sediment carried by the river that forms the foundation of the salt marsh.
