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Who has been searching for Odysseus? A) Calypso B) Hermes C) Poseidon D) Telemachus
Who has been searching for Odysseus? B) Hermes
Expert answered|hamilG66|Points 50|
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Asked 5/13/2013 7:02:56 AM
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What causes low ozone concentrations in the atmosphere?
Weegy: Ozone occurs naturally at ground-level in low concentrations. [ The two major sources of natural ground-level ozone are hydrocarbons, which are released by plants and soil, and small amounts of stratospheric ozone, which occasionally migrate down to the earth's surface. Neither of these sources contributes enough ozone to be considered a threat to the health of humans or the environment.But the ozone that is a byproduct of certain human activities does become a problem at ground level and this is what we think of as 'bad' ozone. With increasing populations, more automobiles, and more industry, there's more ozone in the lower atmosphere. Since 1900 the amount of ozone near the earth's surface has more than doubled. Unlike most other air pollutants, ozone is not directly emitted from any one source. Tropospheric ozone is formed by the interaction of sunlight, particularly ultraviolet light, with hydrocarbons and nitrogen oxides, which are emitted by automobiles, gasoline vapors, fossil fuel power plants, refineries, and certain other industries. ] (More)
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Asked 5/6/2013 7:09:56 AM
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How long has the oxygen concentration of the atmosphere been at its current level?
Weegy: The oxygen concentration in the atmosphere today (which is at about 21%) has been at its current level for the past 400 million years. (More)
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Asked 5/6/2013 7:14:05 AM
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Where do scientists believe the first gases that created the atmosphere came from?
Weegy: he very first gases were H and He, but they were primordial, and were soon lost. [ The methane, CO2, and nitrogen was probably boiled out of the rocks that formed the planet. A super heated young earth was bombarded with water ice asteroids and they boiled creating steam thus created the atmosphere the big bang! ] (More)
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Asked 5/6/2013 7:17:01 AM
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What causes low ozone concentrations in the atmosphere?
Weegy: air pollution and building damage. (More)
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Asked 5/6/2013 7:17:27 AM
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