The exact heights are 829.8 meters for the Burj Khalifa and 548 feet for City Hall.
Why was our estimate for the Burj Khalifa off so much
more than our estimate for City Hall?

These factors hinder environmental protection efforts in eastern europe.

The red square is a famous historical site that is located in

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.