Ground - Land - Earth
These are all words for the surface that you walk on.
Floor the surface of a room that you walk  on: She was sitting on the floor watching  TV. 
  Ground (often the ground) the solid  surface of the earth that you walk on: I  found her lying on the ground. | The  rocket crashed a few seconds after it left the ground. 
  Land the surface of the earth that is  not sea: It was good to be back on dry  land again. | They fought both at sea  and on land.
  Earth (often the earth) the solid surface  of the world that is made of rock, soil, sand, etc.: You could feel the earth shake as the truck came closer.
GROUND, LAND OR EARTH?
  Ground is the normal word for the solid  surface that you walk on when you are not in a building or vehicle. You can use earth if you want to draw attention  to the rock, soil etc. that the ground is made of. Land is only used when you want to contrast it with the sea: The land beneath our feet. | Feel  the land shake. | Sight ground/earth. | Travel by ground/earth.
PATTERNS
  *on/under the floor/ground/earth
  *bare floor/ground/earth
  *to drop/fall to the floor/the ground/(the)  earth
  *to reach the floor/the ground/land
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  Top Tips Abz Ingles   -   Notes on usage   -   Synonyms
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See also:
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