Which has the lowest albedo a pond an icy lke blacktop hightway or white sidewalk?

Albedo is the measure of how much light is reflected by a surface. The higher the albedo, the more light is reflected. A pond, icy lake, and white sidewalk all have high albedos, meaning they reflect a lot of light. Blacktop highway has a low albedo, meaning it absorbs a lot of light.