What is the symbol of a neutron?

Explain the cause for movement river valley civilization to early industrial centers

Which of the following statements best describes environmental laws in latin america?

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.