They cause the ball to push up in the middle and stretch out at the sides.Īs the drop continues to fall and grow, at some point it becomes too large for the surface tension to hold it together. White lines representing the wind are shown under and around the circular ball. The wind-resistance on the underside of the drop causes the bottom of the drop to flatten, resulting in the drop looking like a hamburger bun. These larger raindrops fall through the air faster. The circular ball falls, melding with other balls around it as it descends. As they fall, the raindrop collides with other drops and continues to get bigger. As these droplets grow, they become heavier and start to fall through the air. Small droplets of water in the atmosphere are spherical in shape due to the surface tension, or skin, of the water molecules. Text on screen - 'The Water Cycle.' Arrows forming a circle link pictures of evapotranspiration, condensation, precipitation and runoff together.īut like most things in our world, when we look at the tiny parts that make up the whole, we can learn a lot more about the phenomena.Īnimation of a circular ball of water in the air. Text on screen - 'Runoff.' This is the water cycle, and it describes how our most vital resource moves through the whole Earth system.
Water runs off into streams, lakes and oceans, or is stored in the ground or in snowpack. The liquid water then falls back to the surface in the form of rain, snow, ice or hail. Another man stands in a snow-covered field. A man in a business suit stands in the rain at a bus stop. Text on screen - 'Condensation.' Shot of clouds. High in the atmosphere, the water vapour then cools down and condenses from a gas back into a liquid. The sun's heat causes water from plants, lakes and oceans to turn from a liquid to a vapour.
Wiggly arrows point up from the water and from the plants towards the sky. Animated flowers and plants sprout from the top.
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