On topographic maps, contour lines that are close together indicate O A. flat land
B. gentle slopes
C. river valleys
D. steep slopes

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

Fred is studying a substance that is made out of only one element. this means that

How does carbon monoxide pose the greatest threat to humans? a. it can be produced by wood fires. b. it can be produced by home furnaces. c. it is produced by acid rain. d. it is produced by modern automobiles.