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…, or parts per million, which is not harmful to humans. Some of its natural sources are bushfires and volcanic eruptions; however, it is also formed by humans. The main indoor source of carbon monoxide is tobacco smoking, and the main outdoor source is vehicle…

…along the pacific shorelines of much of Central America. Inland lies a rugged upland surface produced by earlier volcanic activity. Nearly three quarters of the population live within the volcanic regions and the narrow pacific coastal plain that has been…

…HAWAII <Tab/>In the middle of the Pacific Ocean, there is a subtropical archipelago (a chain of islands) of volcanic peaks, mere dots on the map, so small that historians marvel that they were ever discovered at all. These are the Hawaiian…

…volcanic eruption--would have on the atmosphere and on world temperatures. Aerosols in the atmosphere reflect sunlight, thereby blocking some radiation from reaching the lower atmosphere and warming the Earth. Hansen predicted that an increase in atmospheric…

…is 6,300 feet high. Most of the highest peaks are covered with snow. The first recorded eruption of Mount Etna occurred in the 18th century B.C. Geological studies show that this mountain was active before that time. Since the first eruption, there was about…

…began. Volcanic islands grew as a result of andesitic volcanism associated with the subduction. With continued subduction and convergence, volcanic islands collided with North America and those rocks were thrust up on the continental margin…

…, located off the south-eastern coast of Asia. Consisting of over 7,000 volcanic islands with a total land area of nearly 300,000 square kilometers (approximately the size of Arizona), islands of the Philippines are predominantly mountainous except for densely…

…-lying areas. Prior to the Spanish invasion in the 1500's the Valley of Mexico was one of the most complex and productive agricultural areas in the western hemisphere. Volcanic elements in the soil of the valley were important to the development of the Aztec…

…, Jawa Barat, Jawa Tengah, the special territory of Yogjakarta, and Jawa Timur.         A chain of volcanic mountains run along the island from west to east. These mountains are apart of a fold in the earth's crust which extends from Southeast…

…trunks and fallen logs that were buried in volcanic ash, mud, or sand ages ago and have turned into stone. There is no bark or limbs on the trees, but the wood has been reserved so well that you can still see insect tunnels and lightning scars. The petrifying…