A line graph titled Magnitude 6.8 to 6.9 shows Dates on the x axis from 1970 to 2010 and earthquake numbers on the y axis, from 80 to 210. A line moves along the x and y axes. Which type of information could be displayed using this line graph? a comparison of how frequently earthquakes occur in different areas over a period of time the percentage of grades obtained by one class on a certain test the physical features of a given land mass the number of students in one class in a local school