Warm-up: 
1.The driving force (energy) behind water cycle is __________________.
 2.Transpiration is __________________.
3.________of the Earth’s water is salt water. ____ of the earth’s water is fresh water.

Classwork:

Review water cycle, water composition, human usage (using dry-erase "boards")
Prequiz to ocean floor
Ocean floor "peer-teaching"

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