This video below is a cartoon, and the characters give a good explanation of fronts, but they make a few little mistakes:
1. They say "it creates some weather," but they mean, "it creates some precipitation.
2. Don't throw a snowball at someone's head, even if you are demonstrating science.
Also, they tell you the names of each different warm and cold front in the United States, which is interesting, but won't be on your fourth grade test.
http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/air-masses-and-fronts.htm
This site will show a scientific demonstration that PROVES warm air rises above cold air (just like warm water rises above cold water). There is a video ad that plays before the demonstration that you have to watch (or mute the sound).
http://www.weather.com/video/creating-a-weather-front-19179
1. They say "it creates some weather," but they mean, "it creates some precipitation.
2. Don't throw a snowball at someone's head, even if you are demonstrating science.
Also, they tell you the names of each different warm and cold front in the United States, which is interesting, but won't be on your fourth grade test.
http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/air-masses-and-fronts.htm
This site will show a scientific demonstration that PROVES warm air rises above cold air (just like warm water rises above cold water). There is a video ad that plays before the demonstration that you have to watch (or mute the sound).
http://www.weather.com/video/creating-a-weather-front-19179