The Earth moves in predicable patterns. One of these patterns causes the seasons as the Earth moves around the Sun along its elliptical orbit. This movement is referred to A. a rotation B. an equinox C. a photoperiod D. a revolution

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?