Nellie Lathrop Helm, Uncle Robert's Geography (Uncle Robert's Visit…
“ Susie and Donald were puzzled. Frank's face lighted up as he said:"I think you mean the air, Uncle Robert.""You are right, Frank. The great ocean in which we live is the air, or, as it is called, the atmosphere. The atmosphere is just as much a part of our world as the rock and the water. The rock we may call solid, the water fluid, and the air gaseous. Solid, fluid, gas." ”
