Search Essays

…origin. Earth is nowhere near "generic", it is a very special planet. At first, our planet Earth consisted of only deadly gasses, volcanic activity, and many electrical storms. Carbon, Hydrogen, and other gasses soon mixed, over and over and over, along…

…and often occurs in a somewhat predictable manner. Primary succession, (fig 5-4, pg 87) occurs following formation of a new, yet barren habitat for colonization. Such a habitat may be formed by volcanic activity, glacial activity, or strip-mining; it initially…

…were imprinted and preserved in volcanic ash. These 3.6 million-year-old footprints seemed to match the fossils that were previously found in the area, belonging to the Australopithecus afarensis species. The footprints were human-like and belonged…

…profile. Azonal soils are not associated with specific climatic-vegetation zones and they tend to have very poorly defined horizons. In Britain azonal soils exist in the form of till, scree, sands and gravels, sand dunes, salt marshes or volcanic soils…

…This is a true story about a day's adventure in the Mammoth Lakes area. Mammoth Lakes is located just south of Yosemite, California. The Mammoth Lakes valley used to be an extremely active volcanic crater. The area is still active, but you only feel…

…method, is possible due to volcanic ash and rocks found near many fossil sites. Rocks and ash created in this manner contain potassium-40, but no argon. As time passes, the potassium-40 decays into argon-40. In the laboratory, the sample is reheated…

…. It is the difference between this ratio now and the time is died that allows a date for it to be established. Potassium-argon dating, another dating method, is possible due to volcanic ash and rocks found near many fossil sites. Rocks and ash created in this manner…

…of the cosmic gases a secondary atmosphere developed, deriving from the earth itself. For many millions of years after its formation, the earth's surface was probably molten and, even after a thin outer crust had solidified, there was incessant volcanic action…

…. Within that plateau lies many layers of rock from over 300 million years ago to relatively recent volcanic rock. The Colorado Plateau begins in western Colorado and extends through Glen Canyon. Uplift made the meandering streams of the Colorado River run…

…. In his theory of the war, Michael F. Holt primarily considers the timing of the conflict. He feels that the breakdown in the two party system created a panic among citizens and that this panic erupted into war. The only problem with this theory…