Does lava have any chemicals inside?

Question: Does lava have any chemicals inside?
- Keywords:
  chemical,
  lava,
  volcano
Asked by issi2001 to Anil, Blanka, Emma, Mike on 4 Jul 2012.
- Emma Trantham answered on 4 Jul 2012:
  
  Yup it does.
  
  Lava is basically liquid rock and rocks have lots of elements or chemicals in them so they also get into the lava.
  
  Common chemicals in lava include aluminium, silica, iron, magnesium.

Question: Does lava have any chemicals inside?