probably turf or grass
No, it is not. The new Yankee Stadium, like the old stadium, is natural grass.
It is astroturf. The field was replaced with field turf in 1999 with Ditka's ok and then replaced with an improved type of astroturf after katrina.
A field of grass or turf
Natural grass, artificial turf, and the new manufactured turf which looks like grass but made out of rubber.
Not always it depends
No. Cowboys Stadium utilizes a type of field turf, which is one of the latest generations of artificial turf. It consists of small, synthetic blades of grass, coupled with a layer of small rubber pellets that are supposed to soften a football player's fall. The turf is laid out strips of carpet that are five yards in width, and reach from sideline to sideline. The base of the stadium floor is concrete, and the retractable dome roof is usually closed, so maintaining a natural grass playing surface is not practical. The stadium uses two playing surfaces; a pro-style field for NFL games and a NCAA college football playing surface, which has a wider hash mark separation in the middle of the field. The turf is usually removed for concerts and other non-football related events. Experts claim that not only is field turf more cost-effective than natural grass, but it is also safer, as athletes are less likely to suffer the types of knee ligament injuries that occur on grass from having their feet planted down in sod and then trying to pivot.
Reliant Stadium Houston has a movable pitch system from turf company Strathayr
Some football fields are artificial turf and some are real grass.
If it is natural turf, aka grass yes