A: A synthetic 'grass', as best can be put. Small fibres that look fluoro green. Usually a thin layer, with some hard surface underneath, such as concrete...some sports are played on fields of astro-turf, such as hockey and indoor soccer.
Why was it so obvious that I could touch my elbow with my tongue? Your not physically supposed to be able to do that? (sister said that to me, then stated that approximately 90% of people will try, upon hearing that fact)