Volcanic eruptions destroy buildings and productive land, and cause injuries and fatalities to life. Why, then, is volcanism considered a constructive process?
Volcanic emissions played an important role in the origin and evolution of the atmosphere and hydrosphere. The continents are composed in part of volcanic and plutonic rocks, and oceanic crust is produced igneous activity. In addition, weathering of lava flows, pyroclastic materials and volcanic mudflows converts them to productive soils.
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____________________ erosion occurs when water carves small channels into a soil bed. Fill in the blank(s) with the appropriate word(s)
The Sahrawi Republic is not recognized by
A) Mauritania. B) Morocco. C) Spain. D) the United Nations. E) the Polisario Front.
What is the major criticism for the expansion of biofuel resources?
A. The technology is lacking to create good biofuels. B. Biofuels can only be used in vehicles. C. Only wealthy countries would be able to expand the use of the resource. D. It would create competition between food and fuel sources.
When did the British set about withdrawing from South Asia altogether?
A) after the Seven Years War B) after World War I C) after World War II D) during the Vietnam War E) none of the above