In one word, what is precipitation?
ESS2-5 Learning Progression 4 - Part 4 Target
Standard, learning progression, and target
Precipitation is liquid or frozen water that falls from the atmosphere Precipitation can take many forms, including rain, snow, hail, or sleet Precipitation influences weather patterns in many ways
What is precipitation?
What did you notice about the rain? (Color, matter state, your own experience)
Rain forms when water evaporates into the air, condenses, and then falls from a cloud when there's too much water Rain is a liquid form of precipitation Freezing rain is extremely dangerous Have you experienced freezing rain?
What did you notice about the sleet? (Color, matter state, your own experience)
Sleet forms when water freezes and crystalizes, drops from clouds, partially warms up and then freezes again Mixture of snow and rain Sleet is a solid form of precipitation Different from hail because it's partially frozen and usually happens during the winter
Would You Rather
Turn and Talk What did you notice about the hail?
Hail forms during thunderstorms when raindrops are caught in an updraught, gets pushed above freezing level in the atmosphere It tries to fall because of gravity but keeps being pushed up by the updraught growing larger and larger until it finally is too heavy and falls Hail is a solid form of precipitation Can grow to be the size of golf balls (breaks windows)
Talk with your whole group What did you notice about the snow?
Snow forms when tiny ice crystals in clouds stick together to form snowflakes If enough crystals stick together, they become heavy enough to fall to the ground Snowflakes that descend through moist air that is slightly warmer than 32°F will melt around the edges and stick together to produce big flakes
The driest place on Earth is the Atacama Desert in Chile, where it can go for years without rainfall. The place with the highest average annual rainfall is the village of Mawsynram in northeastern India with 12000mm of rain (that's about 472 inches per year, Portland's average is 36 inches)! Raindrops can move at speeds up to 20 miles per hour! Snowflakes can have up to 200 sides! Petrichor is the earthy smell of rain after a long period of dryness, so yes - you can smell rain
Draw / write: What type of precipitation that we learned about is your favorite? (Rain, sleet, hail, snow)
Next time (Thursday), we'll learn how precipitation affects weather patterns!
Rain Sleet Hail Snow Atmospheric Column