Fact 1: Some precipitation that falls on land may soak into the ground, becoming groundwater.

Fact 2: Wells are drilled into groundwater and springs are fed by groundwater.

Given the two facts above, answer the question "Springs can be fed by what?" with the following options: 
- mechanical waves
 - vernal equinox
 - precipitation
 - rainfall
 - digestive track
 - water vapor
 - aqueous solution
 - carnivores


 

   precipitation      