Fact 1: Sunlight and rain can cause a rainbow.

Fact 2: Rain water contains small particulates and acid.

Given the two facts above, answer the question "Sunlight and water containing small particulates and acid can cause what?" with the following options: 
- flooding
 - symptoms
 - rainbow
 - erosion
 - Pollution
 - toxins
 - imbalanced
 - disease


 

   rainbow      