Which of the following connects european nations? a. railways b. the chunnel c. communication systems d. all of the above.

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.

What are mountains that divide european russia from asian russia?

American consumption has had which of the following effects on the environment?