Motocross, Supercross, Arenacross, Freestyle Motocross, Supermoto

He raced the Supercross series but is not racing the Motocross series for 09.

First of all, you can't play motocross, you race motocross.

Motocross is the outdoor version of dirt bike racing. Supercross is indoor. Professional motocross racers race for 30 minutes plus 2 laps.

I assume by the word "was" you mean when was the first motocross race or when was motocross racing started. It started in Europe in the early 1920's, for the U.S. it come into prominence in the early 1960's.

The best place to buy pants suitable for motocross racing in Houston would be a specialized racing supplier such as JM Racing or Houston Motocross. Yakaz Motorcycles also has a wide range of motocross racing apparel including used items and youth sizes.