5. describe desertification. (1 point)
6.list one cause and the effect associated with that cause. (2 points)
answer as soon as possible

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.

Which statement describes the formation of our sun? a disk formed of long trails of stars coiled into a spiral. it formed an elliptical flattened disk. heat and gases contracted within a nebula. gravity pushed stars away from a center core.