An Introduction to Economic Geography - Vol. 1

By Wellington D. Jones; Derwent S. Whittlesey | Go to book overview

CHAPTER IV
BEDROCK AND MINERAL DEPOSITS

BEDROCK AS AN ELEMENT OF THE NATURAL ENVIRONMENT
1. Think of all the ways you can in which the composition of solid rock and its distance beneath the surface of the ground have a bearing on (a) digging cellars, (b) excavating canals, (c) constructing subways, (d) obtaining foundations for skyscrapers and other heavy buildings, and (e) building large dams. Read "Engineering Problems as Related to the Depth of Bedrock (p. 261).
2. What are the common uses of rock? See Figures 279 and 280.
3. What characteristics must good building stone possess?
4. With the points of question 3 in mind, consider the utility of each of the following: granite, sandstone, limestone, slate, marble, shale. Read "Building Stone" (p. 262). Examine samples on display.1
5. In many places brick and tile have very largely superseded stone as building material. Suggest reasons for such a change. Read "Mineral Building Materials Other Than Stone" (p. 263).
6. What are the advantages of concrete as building material, over stone and brick? What materials are used in concrete?
7. What would you conclude as to the character of the region surrounding each of the following places where public buildings, and foundations and trimming of houses are largely of the materials noted: (a) Woodstock, Illinois: bowlders; (b) Joliet, Illinois: limestone; (c) Zanesville, Ohio: brick; (d) Aberdeen, Scotland: granite?
8. What largely determines whether crushed stone or gravel is used for concrete and road macadam in a given locality ?
____________________
1
Specimens of rock can be obtained from supply houses such as Ward's Natural Science Establishment, 84 College Avenue, Rochester, New York.

-76-

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