NASA
Nasa: Space Place: What Causes the Seasons?
A fun resource that teaches students the reasons why Earth's four seasons happen they way they do.
Oklahoma Mesonet
University of Oklahoma: Overview of Meteorology
The University of Oklahoma explores numerous types of weather and atmospheric changes, as well as the reasons behind them. Content details the four seasons, common meteorological variables, the vertical structure of the atmosphere, how...
National Geographic
National Geographic: A Reason for the Season
This site provides a learning activity that can be adapted for all age levels that deals with the seasons. Students are asked to become a "season sleuth" and discover what causes the seasons to change.
Science U
Science U: Reasons for the Seasons
This webpage uses diagrams and video to explain the causes of the seasons.
Scholastic
Scholastic: Dirtmeister's Science Lab: Let the Sun Shine In
Students graph data reflecting time of day and length of shadow, and then draw conclusions about Earth's seasons and position in relation to the Sun.