42
Average of 8 deaths a year in American football.
24.
2
How many football Super Bowls had been held in 1981
42
There are four 15 minute periods in arena football. They also play an overtime period if needed.
In high school football they are classified as quarters.
there 3 periods and 20 minutes a period
American football.
Californium hasn't "periods" inside.
3 periods
7 periods.
6 periods
there are four periods in basketball
there are 7 periods in the periodic table118
4