Fact 1: Awarm front causes cloudy and rainy weather.

Fact 2: If warm air is advancing on cold air, the front is designated a warm front.

Given the two facts above, answer the question "What is a result when warm air advances on cold air?" with the following options: 
- heat
 - dry air
 - blue skies
 - rain
 - storms
 - drought
 - Injury
 - force


 

    rain     