She has found the arrival times of the P-waves and S-waves. She wants to calculate the time difference between the two waves. Which calculation should Sandra make? A)P-wave arrival time plus S-wave arrival time
B)P-wave arrival time minus S-wave arrival time
C)S-wave arrival time plus P-wave arrival time
D)S-wave arrival time minus P-wave arrival time

4. now look at the green lines you created by connecting the three boiling point data points and the three melting point data points. for each of these lines, describe any trends you see. 5. locate the elements on your periodic table that you circled in green on your graph. what term or description would you use to identify these elements with respect to the periodic table? 7. using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers.