The world's identified and unidentified coal reserves should last at least ____ years at current usage rates
a. 10
b. 50
c. 100
d. 150
e. 200
E
Environmental & Atmospheric Sciences
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Will a soil comprised of a combination of sand 10 percent, silt 20 percent, and clay 70 percent tend to have high or low porosity?
Using Figure 27-1, the standard soil texture triangle, answer the question. What will be an ideal response?
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The zone of saturation is also commonly referred to as
A. aphreatic zone. B. aeration zone. C. phreatic zone. D. vadose zone.
Environmental & Atmospheric Sciences
Trilobites, an abundant organism during the Early Paleozoic and less abundant during the Late Paleozoic, survived to
the Cenozoic. a. True b. False
Environmental & Atmospheric Sciences
A warm spell called the Bölling-Alleröd period occurred about 6,000 years ago
a. True b. False
Environmental & Atmospheric Sciences