Knowing the importance of assessing coal reserves in terms of energy content per unit weight, which region has the most valuable coal reserves?
A) Africa
B) Australia
C) Europe
D) Asia
E) South America
D
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According to this graph, which shows water balance for the Ogallala aquifer, which of the following statements are true?
A) More water is taken out of the aquifer than is gained from recharge.
B) Less water is taken out of the aquifer than is gained from recharge.
C) Springs and rivers take out more water than does pumping.
D) As the aquifer dewaters, it expands, increasing the amount of pore space in which to store water.
Which of the following best matches the description?An unwanted plant.
A. micronutrient B. pheromone C. chlorinated hydrocarbon D. persistent pesticide E. rodenticide F. macronutrient G. biocide H. auxin I. herbicide J. micronutrients K. weed L. organophosphate M. macronutrients N. soft pesticide O. biomagnification P. fungicide Q. hard pesticide
Temperature increases in the stratosphere because
A) air density also increases. B) the stratosphere captures most of the heat radiated from Earth. C) the stratosphere borders the thermosphere. D) the stratosphere contains ozone molecules. E) the stratosphere contains nearly all of the atmosphere's carbon dioxide.
By Earth's history standards, the Grand Canyon is ________
A) not important B) as old as the Earth C) very old D) youthful E) becoming a first-order landform