Are sand dunes constructive and destructive

A constructive force affects the earth's surface by building it up while forming new crust and landforms like mountains, islands, deltas, and sand dunes

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)

answer is d hope this