Explain what a caisson is and describe the two types of caissons that are used.
What will be an ideal response?
A caisson is a watertight shell in which construction work is carried out below water level. Caissons may be open or pneumatic. The top of the open caisson is exposed to the weather, and work is performed under normal atmospheric pressure. Pneumatic caissons are air- and watertight. They are open on the bottom so soil excavation can be accomplished.
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During the Salem witchcraft trials, most of those accused as witches were
A. property-owning women. B. from the ranks of poor families. C. primarily un-Christian. D. women in their late teen years. E. from subsistence farming families.
Which of these is a recommended treat for ferrets?
A) cooked meat scraps B) raisins C) plain vanilla ice cream D) licorice
The most important concern of the plumbing profession is
A. safety B. installing DWV systems C. installing potable water systems D. preventing cross connections
ROM is a type of nonvolatile memory
Indicate whether the statement is true or false