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Precipitation. Chapter 8 Section 2. Standard . S 6.4.e Students know differences in pressure, heat, air movement, and humidity result in changes in weather. . Anticipatory Set . Squirt students above their heads What am I doing? What is this called?
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Precipitation Chapter 8 Section 2
Standard • S 6.4.e Students know differences in pressure, heat, air movement, and humidity result in changes in weather.
Anticipatory Set • Squirt students above their heads • What am I doing? • What is this called? • How would you describe the droplet that just hit your face?
Language of the Discipline • Precipitation
Precipitation • Any form of water that falls from clouds and reaches Earth’s surface. • Not all clouds produce precipitation • Cloud droplets or ice crystals must grow heavy enough to fall from the air • As they grow larger, they move faster and collect more rain
Types of Precipitation • Common Types: rain, hail, sleet, snow and freezing rain • Rain- drops of water if 0.5 millimeters big • Drizzle or mist falls from stratus clouds • Hail- Round pellets, like an onion • A hailstone starts as an ice pellet, reaches a cold spot in cloud and add layers to the pellet, it will repeat this process a couple of times. When it is heavy enough, it will fall towards Earth. • Causes damage to crops, buildings, vehicles.
Snow- water vapor is converted into ice crystals (snow flakes). 6 Sides, different shapes and patterns • Powder snow: when snow falls through cold, dry air • Sleet- raindrops that fall through 0*C (freezing point of water). Smaller than 5 diameter • Freezing Rain- when rain freezes when it touches a cold surface (not in the air). • In an ice storm a layer of ice builds up on every surface. It can make walking on surfaces dangerous
Checking for Understanding • What are the common types of precipitation? • What is sleet? • What is freezing rain?
Guided PracticeIndependent Practice • Guided Practice- Worksheet • Stop! Check your answers with your teacher • Independent Practice- Workbook