Sleet:
Sleet kidsgeography
What's the Difference Between Snow Sleet and Freezing Rain ? Wonderopolis
Sleet TreeHouseWeatherKids
Sleet NationalGeographicSociety
Sleet AcademicKids
Hail:
Hail kidsgeography
What Causes Hail? KidNews
Hail Facts for Kids Kiddle
Hail TreeHouseWeatherKids
Hail Storm EasyScienceforKids
Hail NationalGeographicSociety
Cool Facts for Kids About Hailstones EasyGeographyforaKids
Videos:
What is Sleet? (0.53)
The Difference Between Snow, Sleet and Freezing Rain? (1:24)
Snow, Freezing Rain, Sleet: Facts About Winter Precipitation (1:35)
What is a Hailstorm? (4:18)
What is Hail? Explained for Kids by Professor Henry Hailstone (1:50)
How Does Hail Form? MakeScienceFun (2:06)
Activities and Experiments:
CuriOsyssey.com:
How to Make Ice Swirl With Gift Wrap
How to Explore Melting Ice
Explore Colors With Ice