Alluvial fans which have expanded and joined over time form a landscape feature known as a(n) ________.

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Alluvial fans are masses of sediment deposited by streams as they leave narrow mountain canyons and enter into broader, flatter valleys. Over time, these alluvial fans may expand and join together, forming a gently sloping plain called a bajada. Plinths are flat-topped landforms with steep sides, slip faces are steep slopes of sand dunes, sand plains are flat areas covered with sand, and alkali flats are salt flats or dry lake beds.

Alluvial Fans Which Have Expanded and Joined Over Time Form