Invite students to explore how objects' shadows change through the day and year. Have them use popsicle sticks to mark the path of a tree, flagpole, or other object as it moves across the ground during the day. You can also map the shadow's size and location during different seasons, and prepare overlays showing shifting patterns of light and shadows. Have students consider how the size of shadows is related to the angle of sunlight. How might understanding this relationship help in choosing a greenhouse site?

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