Fact 1: When a river floods , that river deposits soil in flood plains.

Fact 2: Major river is the Colorado river.

Given the two facts above, answer the question "what deposits soil in flood plains when it floods?" with the following options: 
- the Colorado
 - the Pacific Ocean
 - water evaporation
 - bullfrogs
 - peachleaf willow
 - a hydraulic system
 - mussels
 - hydrogen


 

 the Colorado        