Read this excerpt from "The City Without Us" by Alan Weisman:Enemy number one is the salt that highway departments spread on the roadways each winter—ravenous stuff that keeps eating steel once it's done with the ice. Oil, antifreeze, and snowmelt dripping from cars wash salt into catch basins and crevices where maintenance crews must find and flush it. With no more people, there won't be salt. There will, however, be rust, and quite a bit of it, when no one is painting the bridges.Which sentence best states the main idea of this section of the chapter?A.Salt can be used as a metaphor for a monster that has a voracious appetite.B.Salt is the most damaging compound that people can use to fight snow and ice.C.Salt flushing and painting rusty bridges consume a large part of a city's budget.D.Salt and rust are corrosives that have damaging effects on a city's infrastructure.

What is a Salt Bridge?

Explain to the people of Westfield how the rust in their water formed.

Mild non-corrosive basic salt is

Which situation is the clearest example of cause and effect in "The City Without Us"?A.Water in Manhattan's underground spaces has to be pumped out daily.B.Some time in the next 100,000 years, glaciers will cover all of Manhattan.C.If flooding were to go unchecked, steel support beams in buildings would rust.D.While suspension bridges will last a few centuries, truss bridges may last 1,000 years.SUBMITarrow_backPREVIOUS

Which situation is the clearest example of cause and effect in "The City Without Us"?A.Central Park has a garden that houses plants mentioned in Shakespeare's plays.B.Unheated buildings would result in a destructive freeze-thaw cycle.C.While suspension bridges will last a few centuries, truss bridges may last 1,000 years.D.Water in Manhattan's underground spaces has to be pumped out daily.SUBMITarrow_backPREVIOUS