Science II Mr. Ray Stafford 14 October 2012 The Endangered Appalachian Elktoe (Alasmidonta raveneliana) There are several mussel listed on the endangered species in the state of Tennessee but one that stood out the most is the Appalachian Elktoe. There is little known about how this species became endangered but it seem that pollutants to the Tennessee rivers and streams are the main culprits. The Elktoe was added to the Federal Endangered list November23‚ 1994. Since the listing‚ there are
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Soil Erosion Erosion is a natural process by which rock and soil are broken loose from the earth’s surface at one location and moved to another. Soil erosion forms and changes land by wearing down mountains filling valleys‚ and making rivers appear and disappear. Erosion is usually a slow and gradual process that occurs over the course of thousands or millions of years. However the rate of erosion can be speeded up by such human activities as mining. How erosion occurs? Ero0sion begins with
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The Littoral Zone The littoral zone‚ commonly referred to as the intertidal area‚ is where the land and water meet. It is rich in nutrients and oxygen and is home to a variety of organisms. The littoral zone provides some plants with the opportunity to complete their growth cycle‚ but the changing water level also brings about some environmental problems‚ such as soil erosion and biodiversity reduction (Chen). The word littoral means shore. Therefore‚ the littoral zone of a pond is
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Ring Species: A Catalyst for Speciation After spending time on the Galapagos Islands studying the origin of various species‚ former divinest Charles R. Darwin proposed the evolutionary theory of natural selection‚ a mechanism by which advantageous variations in a population are preserved while unfavorable variations are lost (Berkeley‚ 2008). As a result of these variations‚ some individuals are better acclimated to their environment than others. This results in the better-suited individuals outcompeting
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Soil Pollution The process of contamination of the land surface of the earth is referred to as land pollution. It results from human activities that cause imbalance in nature. Dumping human and industrial waste harmful agricultural practices and exposing the land to harmful chemicals leads to the pollution of land. We speak of water and air pollution and rarely even think of the adverse effects of land pollution. Let me share with you some of the important facts about land pollution. Land
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These soil forming factors continue to affect soils even on "stable" landscapes. Materials are deposited on their surface‚ and materials are blown or washed away from the surface. Additions‚ removals‚ and alterations are slow or rapid‚ depending on climate‚ landscape position‚ and biological activity. Parent material. Few soils weather directly from the underlying rock . These "residual" soils have the same general chemistry as the original rocks. More commonly‚ soils form in materials that have
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Detailed Lesson Plan in Science IV (Soil Erosion) I. Learning Objectives a. Identify the agents of soil erosion. b. Explain how each agents cause erosion. c. Perform related activities enhancing knowledge about soil erosion. d. Enumerate ways and means on how to help prevent soil erosion. II. Subject Matter a. Topic: Soil Erosion b. References: c. Concepts: Soil Erosion and its Effects d. Sciences Processes: Observation‚ Experimenting‚ Analysing e. Materials: 2 large
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The quest of the Sangreal in Le Morte D’Arthur depicts several of the characteristics of Medieval Romance. For instance‚ Sir Launcelot’s struggle to find the grail and come to terms with his sins reflects the quality. Sir Launcelot’s attempt at the grail begins on page 387‚ and the ensuing events show the knight as the tale’s protagonist. Another key element of this literature was the notion of a quest and the physical and mental struggles involved in it. In portraying the fundamental characteristic
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Keystone species play a large role in each ecosystem‚ they have the ability to alter their ecosystem or be the reason they completely collapse. Keystone species are the reason that many different species exist‚ these other species highly depend on the keystone species for survival‚ if a single keystone species were to go extinct‚ it is likely for other species populations to decrease. Other species benefit from keystone species in a variety of ways‚ such as food supply‚ shelter‚ or a water source
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Global climate change has positive and negative effects on marine and terrestrial ecosystems. The cause of global climate change is said to be because carbon dioxide is being emitted through the large scale burning of oil‚ coal and gas‚ with an additional contribution coming from clearing of tropical forests and woodlands which results in wildlife life destruction. The carbon dioxide traps heat from the sun in the earth’s atmosphere and prevents it from being sent back out into space. The heat that
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