Students become botanists and climatologists, and investigate seasonal changes. This unit can be done in conjunction with the FOSS Trees science curriculum by studying a deciduous “class tree.” Students observe the changes the class tree goes through as the seasons change. These changes are recorded in observation journals. Students contrast and investigate changes in the weather, changes in the length of the day, and changes in the personal accommodations they make due to seasonal change. With guidance, students create multimedia presentations and weather graphs to compare weather in other parts of the world. Students publish seasonal newsletters and class books for the National Arbor Day Foundation.