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The garbage patchs are a site with high concentrations of trash. They are formed by the ocean gyre, where the ocean have convergences zones forming a circle of currents. When the garbage join the circle, it can't go out, cause the currents make a kind of a permanent "wall".
We can locate garbages patchs in the South Atlantic Gyre, Indian Ocean Gyre and the South Pacific Gyre.
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The answer is (b.) the first gulf war
The first gulf war is between the coalition forces led by the US against Iraq. It is also know as Persian gulf war, Kuwait war, first Iraq war, or Iraq war. It started on August 2, 1990 and ended on February 28, 1991. While the six-day war is the conflict between Israel and Egypt in 1967 and Yom Kippur War in 1973.
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The answer is a).
Mining generates (in 2014) just $44.7 billion.
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The first one is correct and the second one is B