water cycle oxygen-carbon dioxide cycle pollution The cycle concept is introduced by means of experiments with evaporation and condensation of water that lead to an understanding of the water cycle.
(water cycle oxygen-carbon dioxide; is introduced; by means of experiments with evaporation and condensation of water) (means of experiments with evaporation and condensation of water; lead; to an understanding of the water cycle)
water cycle oxygen-carbon dioxide means of experiments with evaporation and condensation of water
is introduced lead
by means of experiments with evaporation and condensation of water
to an understanding of the water cycle