Sunlight and rain can cause a rainbow, and liquid precipitation is measured with a rain gauge. Given these facts, what can cause a rainbow among the following options:
- photosyntehsis
 - tornadoes
 - sun and hot weather
 - snowfall and fog
 - chemical messengers
 - sun and liquid precipitation
 - algae and plants
 - photosynthetic pigments?


 

      sun and liquid precipitation   