What is the definition of cryovolcanism?
A) Pyroclastic volcanism that ignites methane-rich atmospheres
B) Cessation of volcanism because of increasing atmospheric pressures
C) Increase in rate of tectonic motion due to lubrication of ice
D) Eruption of magmas derived from partial melting of ice
Answer: D
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The most important source of the free oxygen in our atmosphere is:
A) green plants that carry on photosynthesis. B) the dissociation of water vapor in the upper atmosphere. C) deforestation. D) volcanic degassing.
Russia and Brazil, currently classified by the United Nations as having relatively high levels of development, are especially rich in inputs critical for industry
Indicate whether the statement is true or false.
What kind of volcano erupts runny lava?
A. cinder cone B. shield C. composite D. basaltic
In 2008, Russian troops entered the __________ region to support its move towards independence from __________.
a. South Ossetian ; Georgia b. Abkhazia; Transcaucasia c. South Ossetian; Chechya d. Adjara; Georgia e. South Ossetian ; Transcaucasia