How are oil and gas trapped in rock strata? What are these traps called? What will be an ideal response?
Rock strata that can trap oil and gas are known as stratigraphic traps. A reservoir rock has an overlying
cap rock, and it is the difference between the rock types that traps the hydrocarbons. Structural traps
result when rocks are deformed by folding, fracturing, or both. The hydrocarbons migrate to the tops
of these structures. These require only a good reservoir rock to hold the oil and gas.
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Water pollution in less-developed countries
A. is mainly caused by untreated sewage. B. occurs less frequently than in more-developed countries. C. does not include industrial wastes. D. does not include agricultural runoff. E. should improve soon.
In 1994 the United States, Canada and Mexico were linked through the
A) North American Free Trade Agreement. B) European Union. C) United Nations. D) North Atlantic Treaty Organization.
Air is often much cleaner after a rain primarily because
A) droplets and crystals scavenge particulates. B) particulates act as condensation nuclei. C) gravitational settling works faster when the air is saturated. D) the lower temperature increases the efficiency of automobile engines.
Building stone, sand and gravel, and fertilizers are industrial materials that are a special class ore deposits but are usually subject to the same regulations as other ores
Indicate whether the statement is true or false