I'm not sure about today's marking substance, but for many years, in the old days, it was nothing more than POWDERED CHALK, which I think is Calcium Carbonate. Today, some are using synthetic materials, or even spray paint.
skill
Magnetic field lines don't cross.
Yes, usually. The lines are simply shown to illustrate direction and strength of the field.
A ruler
ther are two lines of symetry on a football pitch
what are the lines calledat each side of a football field called
skill
yardage markers
A touch football field typically measures 100 meters in length and 64 meters in width. The playing area includes end zones that are usually 10 meters deep at each end, making the total length of the field 120 meters. The field is marked with lines for various zones, including the halfway line and try lines, which are located at the start of each end zone.
In the early years of American football, the field had vertical lines as well as horizontal lines, creating the "gridiron" (or checkerboard) effect. The rule was that each play would begin in the square at which the previous play ended. The vertical lines were replaced by hash marks sometime around 1910-11.
Magnetic field lines do not have physical existence or substance; they are a visual representation of the magnetic field direction and strength. They are not tangible lines that can be touched or seen.
The infield lines are about three inches wide. The wider lines surrounding the field and end zones are a yard wide.
The slot receiver lines up between the offensive line and the wide receiver on the same side of the field in football.
linger ans singer
The numbers on the football field are located on the yard lines, running horizontally across the field from one end zone to the other. They indicate the distance from the end zone in yards.
Ignoring the asymmetric drawings painted on the field (in the end zones, etc) depicting the teams playing, it has 2 lines of symmetry.
Kind of. If you were to look at an American football field from above, the way the chalk lines are laid out for the yard lines and end zones would make it look something like a gridiron.