Try and do the trick very SLOWLY, what happens to the stack? What happens to the bottom coin? Why do you think this happens?

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Which characteristics can be used to differentiate star systems? check all that apply.