Efervescing or Effervescing: How To spell?

The word Efervescing is misspelled against Effervescing, which is present continuous of "Effervesce"

Effervescing has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings E & ervescing which should not be misspelled with single 'F'
Wrong Spelling:  E-f-ervescing 
Correct Spelling:  E-ff-ervescing 
Find more wrongly spelled words of Effervescing to spell it well.

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