What are positive affects of tornadoes

The mantle is made up of which structural zones?

Which of the following statements best explains why there tends to be a greater number of large cities in southern africa than the east africa

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.