What has been determined by studies of gas bubbles in polar ice sheets?
A. A poor correlation between atmospheric temperature and carbon dioxide concentration over time
B. Decreasing levels of atmospheric carbon dioxide over time
C. A good correlation between volcanic gases and sea level change over time
D. A repetitive pattern of glacial and interglacial cycles over the past 800,000 years
Answer: D
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What strategy has been used by the German government to reduce the number of cars owned by urban dwellers?
A. car sharing B. fines for car ownership C. towing of all parked cars D. car theft
The world's most important energy resource today is
A) coal. B) petroleum. C) wind. D) nuclear. E) natural gas.
Mountains are supported by the mechanical strength present in the asthenosphere due to the presence of heavy elements such as iron and magnesium
Indicate whether the statement is true or false
In contrast to the mafic volcanism at rift zones, subduction zone lavas are lower in iron content but significantly higher in
A. water and silica. B. calcium and silica. C. water and magnesium. D. magnesium and silica.