^what keeps us from fall down to the middle of the earth? All
  the stuff thats in the way.

  Chair keeps your butt from hitting the floor. Floor keeps you
  from hitting the dirt. Dirt keeps you from hitting the water
  table, the rocks, the melted rocks (magma) and the very hot
  spinning melted iron magnet at the earth's core.

  Thank you chair - you saved my life yet again.^