Water causes refraction of light, and water is a compound of hydrogen and oxygen. Given these facts, what causes a refraction of light among the following options:
- compound of hydrogen oxygen
 - focusing a lens
 - that material's properties
 - photosynthetic pigments?
 - oxidation reaction
 - a hemisphere is tilted away from the sun
 - sunlight beams
 - solid, liquid, gas


 

 compound of hydrogen oxygen        