How do i use the line of demarcation in a paragraph

answer: there are many ways

explanation: an example of a demarcation is a city limit sign.

an example of a demarcation is drawing an out of bounds line for a baseball field.

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.