Sunlight shining through a clear window hits Jeremy's face while he does his homework. He uses a large wooden block to cover the window. What do the wooden block and the clear window demonstrate?

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.

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Ithink is    record the line that the bottom of the meniscus touches. tell me if it is correct