501 Critical Reading Questions

This passage outlines the past and present use of asbestos, the potential
health hazard associated with this material, and how to prevent exposure.
Few words in a contractor’s vocabulary carry more negative connota-
tions than asbestos. According to the Asbestos Network, “touted as a
miracle substance,” asbestos is the generic term for several naturally
occurring mineral fibers mined primarily for use as fireproof insula-
tion. Known for strength, flexibility, low electrical conductivity, and
resistance to heat, asbestos is comprised of silicon, oxygen, hydrogen,
and assorted metals. Before the public knew asbestos could be harm-
ful to one’s health, it was found in a variety of products to strengthen
them and to provide insulation and fire resistance.
Asbestos is generally made up of fiber bundles that can be broken
up into long, thin fibers. We now know from various studies that when
this friable substance is released into the air and inhaled into the lungs
over a period of time, it can lead to a higher risk of lung cancer and a
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