Scientists have detected an asteroid that is 700,000,000 km from Earth. About how many astronomical units is that?
0.5 AU
1 AU
3.5 AU
O 4.5 AU

Take a guess im getting rid of my account might as well do it in style a fishing boat, with a ladder in it, is leaning against a wall at the harbor. there are 5 oars and 2 fishing nets in the trawler. the distance between two consecutive steps on the ladder is 1 meter. if waves lashing against the wall rise a half meter in every half hour, how long will it take before 6 steps of the ladder are under the waves?

Which of there factors contributed most to us westward expansion in the second half of the nineteenth century?

How does water pollution affect the environment