miércoles, 3 de abril de 2013

UNIT 7. WATER AND AIR ON THE EARTH. The water cycle.

THE WATER CYCLE.

Water on Earth is always changing state and place. This is known as the water cycle.
http://www.epa.gov/ogwdw/kids/flash/flash_watercycle.html

The water cycle.

Explanation of water cycle.

The water cycle.
http://www.youtube.com/watch?NR=1&v=ZzY5-NZSzVw&feature=endscreen
Click


EVAPORATION: when the Sun heats water, water vapour rises.













CONDENSATION: when water vapour cools, it turns into water drop and forms clouds.
Click
















PRECIPITATION: the wind moves the clouds. When the clouds cool, water from the clouds falls as rain. Can be hail, sleet or snow.




















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