The rubber tires ground the bus because carbon black is added when the tires are made, and carbon is a good conductor of electricity.
(The rubber tires; ground; the bus; because carbon black is added when the tires are made) (carbon black; is added; T:when the tires are made) (the tires; are made; ) (carbon; is; a good conductor of electricity)
The rubber tires carbon black the tires carbon
ground is added are made is
the bus because carbon black is added when the tires are made
T:when the tires are made
a good conductor of electricity