4. stairs are considered hazardous when a. the width of the treads does not strictly comply with codes. b. risers are less than 73/4 inches high. c. they're covered with carpeting. d. the height of the risers varies by more than 3/8 inch.

Which theory suggested that the earth was once a signle supercontient that gradually that broke up into the contients that we know today

Canada plays an important role in the global community in all of the following ways except by a. acting as a superpower with influence over europe and asia. b. promoting arms control and disarmament. c. working with the commonwealth of nations to promote trade. d. promoting trade with japan and other asian countries.

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.