Why can we assume that the speed of the EM waves in the atmosphere is essentially the value of c

Acube has a volume of 2011 cubic inches. what is the angle measure between a side of a cube and its interior diagonal?

Which of the following is a source of heat for magma formation? magma plumes in the continental crust friction due to divergence friction due to subduction magma plumes in the oceanic crust

Astone is thrown into a pond. what happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? explain.