Natural Science CLEP Prep Practice Exam

A planet's albedo measures the amount of light that is reflected off its surface. This is important for understanding the planet's overall reflectivity and can give insight into its composition and atmospheric properties. Option A, heat capacity, is incorrect because this refers to the amount of energy required to raise the temperature of a substance. Option C, mass, is incorrect as albedo is not directly related to a planet's mass. Option D, surface temperature, is also incorrect because while albedo can affect a planet's surface temperature, it is not a direct measure of it.