Fact 1: Adelta is formed by deposition of sediment at the mouth of a river by water fanning out. Fact 2: Deltas are usually fan-shaped deposits of sediment that form where currents slow at a river's mouth. Given the two facts above, answer the question "Fan-shaped deposits of sediment form where?" with the following options: - mouth of rivers - bottom of oceans - flooding - near the shoreline - the Great Barrier Reef - entrance of puddles - unidirectional - top of canyons
A:
mouth of rivers