Direct current is the flow of an electric charge?

True or false: the revolution of the earth creates day and night as it rotates around the sun

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

Which sound characteristic is not affected by the relative motion of an object