Noun phrases
Nominalisation
In English we tend to limit the number of verbs in a sentence, especially in
  formal or written English. This is called nominalisation. Compare these
  two sentences:
  - If you read more books, your vocabulary will
    increase. (two verbs)
- Reading more books means an increase in your
    vocabulary. (one verb)
 We do this by:
-using nouns instead of verbs: will increase
   an
  increase
 an
  increase
-using the -ing form
  of the verb: read  reading
 reading
 Here are some more examples:
  -  She succeeded because she worked
    hard. (two verbs)
-  Her success was due to her hard work.  (one
    verb)
-  Man is destroying the ozone layer and this
    is causing skin cancers to increase. (three verbs)
-  The destruction of the ozone layer is the
    cause of the increase in skin cancers. (one verb)