One method of surface mining is to extract the coal into long strips that follow the coal seams that are close to the surface. This is called _______________



Fill in the blank(s) with the appropriate word(s).


strip mining

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____ are used to catch large items of waste material near the point of origin.

A. Interceptors B. Drainage filters C. Vent stacks D. Traps

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Ans: b

a. 100 c. 1,000 b. 10,000 d. 10

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Lumber cut from trees is made of the ____ of the stems

a. bud scale scars c. phloem b. nodes d. xylem

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Solve this proportion.

Fill in the blank(s) with the appropriate word(s).

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