Nitrogen and oxygen gasses are in abundance _____ the Earth.

A. in

B. on

C. above

D. along


  • 'On' is used as a preposition in time expressions with specific days of the week. 
  • 'On' is used flat surfaces both big and small.
  • Sometimes 'on' is confused with 'onto'. The preposition 'on' indicates that something is already in the position. 'Onto' indicates a movement from one place onto to surface of some type.

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