The various classes of coal have been exposed to high heat and pressure for different periods of time. Which of the following lists in order the classes of coal from lowest to highest energy content?
A) lignite, bituminous, sub-bituminous, anthracite
B) anthracite, bituminous, sub-bituminous, lignite
C) lignite, sub-bituminous, bituminous, anthracite
D) lignite, anthracite, sub-bituminous, bituminous
E) sub-bituminous, bituminous, lignite, anthracite
Answer: C
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coal reserves will last for more than 500 years are accurate BECAUSE these estimates include an assumed growth rate of 2% per year. a. The assertion and the reason are both correct, and the reason is valid. b. The assertion and the reason are both correct, but the reason is invalid. c. The assertion is correct, but the reason is incorrect. d. The assertion is incorrect, but the reason is correct. e. Both the assertion and the reason are incorrect.
Provide a natural example of a system without an energy source. What will be an ideal response?
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A. cold and humid B. cold and dry C. warm and supersaturated D. warm and dry E. warm and humid
Ethnonationalist movements have occurred in all of the following, except:
A) South Ossetia B) Tajikistan C) Nagorno-Karabakh D) Chernobyl