The theory that the earth revolved around the sun was first proposed by which ancient greek astronomer?
a. eratosthenes
c. aristarchus
b. aristotle
d. hipparchus

What are seismic dampers and why are they important?

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.

Explain why the rate of urbanisation is in the way it is between developed and undeveloped countries.