a large surface area is more exposed to sunlight
dark_large_area is natural_thing. sun_tanning is not exposure. photosphere is surface. sun_tanning is exposure. area_illuminated_by_sunlight is not sunlit_thing. blocked_sunlight has powerful_effect_on_microclimate sunlight is light. surface is aspect. dark_large_area is not natural_thing. area_illuminated_by_sunlight is sunlit_thing.