What is the difference between a delta and an alluvial fan?

Both deltas and alluvial fans are types of depositary land forms created by rushing rivers.

Explanation:

Both deltas and alluvial fans are types of depositary land forms created by rushing rivers. Alluvial fans are created at the foothills, where streams running from a higher elevation break into low gradient foothills, while deltas are formed at the mouth of streams, where they enter seas or saline water bodies.