The map shows levels of air quality in parts of the united states and canada. what is a contributing factor to the areas with unhealthy levels?
a) concentration of industrial factories
b) large farming populations
c) exposure to ocean water
d) erosion of beach sand

Mike wants to negatively charge a small rubber ball. which of these methods would successfully charge the ball? a) heating the ball in boiling water b) running the ball over a strong magnet c) rubbing the ball back and forth on carpet d) dropping the ball from a tall bulding submit hint forces in nature (s8p5.b) conductors and insulators id: 10402 hint electrons must be transferred.