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

Fact 2: Rain is only one kind of precipitation.

Given the two facts above, answer the question "What may soak into the ground, becoming groundwater?" with the following options: 
- h2o
 - wells
 - H 2 O
 - rain
 - H20
 - blood
 - dust
 - river


 

    rain     