Students know sunlight can be blocked to create shadows.
Light has a source and travels in a direction. As a basis for understanding this concept:
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Make observations to construct an evidence-based account that objects in darkness can be seen only when illuminated.
Develop a model to describe that light reflecting from objects and entering the eye allows objects to be seen.
Make observations to provide evidence that energy can be transferred from place to place by sound, light, heat, and electric currents.