Line graphs are especially useful for showing changes over time, such as variation in the number of tornadoes by month throughout the year.
(Line graphs; are; especially useful for showing changes over time, such as variation in the number of tornadoes by month throughout the year) (Line graphs; for showing; changes; T:over time)
Line graphs Line graphs
are for showing
especially useful for showing changes over time, such as variation in the number of tornadoes by month throughout the year
changes T:over time