What percentage of the earth's atmosphere does O2 comprise? w) 75% x) 50% y) 21% z) 32% Answer : ANSWER: Y -- 21%...
Continental shelves range in width from: w) 1,500 to 5,000 kilometers x) 1,500 to 3,000 kilometers y) 0 to 5,000 kilometers z) 0 to 1,500 kilometers Answer : ANSWER: Z -- 0 TO 1,500 KILOMETERS...
What percentage of the earth's water is fresh water? w) 50% x) 22% y) 7% z) 3% Answer : ANSWER: Z -- 3%...
Which of the following is the approximate ratio of the area of the continents to the area of the earth's oceans? w) 2:1 x) 1:1 y) 2:5 z) 1:10 Answer : ANSWER: Y -- 2:5...
Which of the following areas is closest to the total surface area of the earth in square kilometers? w) 500 million x) 500 billion y) 500 thousand z) 5 billion Answer : ANSWER: W -- 500 MILLION...
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