The continental shelves comprise what percentage o the Earth's total land area? w) 38 percent x) 28 percent y) 18 percent z) 8 percent Answer : ANSWER: Y -- 18 PERCENT...
What percentage of the earth's water is fresh water? w) 50% x) 22% y) 7% z) 3% Answer : ANSWER: Z -- 3%...
Of the energy used in the United States, about wha percent is provided by hydroelectric power? w) 4% x) 20% y) 50% z) 75% Answer : ANSWER: W -- 4%...
The oxygen in the earth's atmosphere was probably produced by which of the following? w) volcanos x) photosynthetic organisms y) radioactive minerals z) meteors Answer : ANSWER: X -- PHOTOSYNTHETIC ORGANISMS...
The jet-stream lies between which two layers of th earth's atmosphere? w) thermosphere and ionosphere x) mesosphere and thermosphere y) troposphere and stratosphere z) stratosphere and mesosphere Answer : ANSWER: Y -- TROPOSPHERE AND STRATOSPHERE...
50.5k questions
47.1k answers
240 comments
7.0k users
