What purpose does the phrase separated by the em dashes serve in this sentence

The story line remains the same. the kids live in what was then one of the remaining beachfront slums, down the coast from the expensive malibu area. the beach was ruled by surfers, but in the afternoon, when the waves died down, some of the surfers, or their younger brothers, fooled around on skateboards. one day, skip engblom, the shop owner, comes up with a key breakthrough, polyurethane wheels: "they grip." with the additional traction, the z-boys try skating the sides of the big, open drainage canal that runs through the area. then comes a brainstorm: because of a drought, the area's swimming pools were drained. the kids started "borrowing" pools when the owners weren't home, to skate the curved sides.” where did “the lords of dogtown” originally practice their tricks? a. the beach c. an open drainage canal b. empty pools d. none of these

Wi n t e r acrostic poem worth 10 points but giving 30

Based on the speaker's viewpoint, whichstatement would he likely disagree with? imagination can be used to gain knowledge.individual knowledge is verified by experttestimony.true knowledge comes from thinking foryourself.knowledge comes from separating yourselffrom the crowd.education does not need to happen in alecture hall.