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Write a hypothesis for Section 2 of the lab, which is about the effect of the angle of insolation on the amount of heat a material absorbs. Use the format "if . . . then . . . because . . ." and be sure to answer this part of the lesson question: "What factors influence the absorption of sunlight at Earth's surface?"

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If the angle of insolation on a material becomes more direct (shifts from a low, grazing angle toward perpendicular), then the material will absorb more heat (show a larger temperature rise) because more solar energy falls on each unit area, reducing reflection and atmospheric scattering per unit area and increasing the intensity of radiation reaching the surface.

Factors that influence absorption of sunlight at Earth's surface: angle of insolation (solar elevation/latitude/time of day), surface albedo/color and texture, material thermal properties (absorptivity, emissivity, heat capacity), surface moisture, and atmospheric conditions (clouds, aerosols, air mass thickness).