Fosilizing or Fossilizing: How To spell?
The word Fosilizing is misspelled against Fossilizing, which is present continuous of "Fossilize"
Fossilizing has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings fo & ilizing which should not be misspelled with single 'S'
Wrong Spelling:  fo-s-ilizing  Correct Spelling:  fo-ss-ilizing 
Find more incorrect spellings of Fossilizing to spell right way.