Part 1 of Essay
The playing field is 120-yd (110 m) long and 53.3-yd (48.8 m) wide. At each end of the 100-yd main body of the playing field, white lines called goal lines mark off the entrances to the end zones. Each team defends one end zone and must carry or pass the ball into the opponent's 10-yd (9-m) end zone to score. Lines paralle ....

Part 2 of Essay
.... occur, and when designated by the officials. Two teams of 11 players play football. Each team tries to move the ball down the field to score in the end zone defended by its opponent. The team in possession of the ball is called the offense, and the team defending is called the defense. Players involved in kicking situations are known as the special teams. The 11 players of the offensive team are divided into 7 linemen, who play on the line of scrimmage (an imaginary line designating the position of the ball) an ....