In Appalachia, many miners are out of work because ________
A) they were fired for protesting mountaintop removal
B) of a moratorium on mountaintop removal
C) of local protests that shut down mining operations
D) they are not needed, since mountaintop removal is highly mechanized
E) coal extraction has decreased because the region is beginning to run out of coal
Answer: D
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The social changes in the United States in the 20th century gave rise to environmental laws concerned primarily with ________.
- management of private land - the settlement of the West - reducing pollution caused by industry - preserving endangered species - mining and homesteading
What is the special property of the mineral halite?
A. It has an extremely high melting temperature. B. It has a hardness of -3. C. It tastes like salt. D. It can transmit electricity. E. It has 5 directions of cleavage.
The ore-forming process of ________ occurs as early-forming minerals settle to the bottom of a cooling magma.
A. mica and quartz B. hydrothermal solution C. gravity deposition D. residue formation E. crystal settling
Which of the following are true about factors that influence weathering?
A. Time is not a critical factor in weathering because physical and chemical processes have not changed much through time. B. Soil and other weathering products tend to accumulate more on gentle slopes than on steep slopes. C. Whether a slope faces toward or away from the sun is not an important factor influencing weathering. D. Chemical weathering occurs fastest in cold or dry climates.