Evaluate how plate tectonics theory helps our understanding of the distribution of seismic and volcanic events(40) The global seismic and volcanic activity is concentrated along the margins of the earth’s plates‚ which are broken pieces of the crust and are moved by convection currents that are caused by heat rising and falling inside the mantle generated by radioactive decay in the core. This movement of the plates and the Earth’s inner activity is called plate tectonics and can cause seismic and
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The Great Lakes (Lake Superior‚ Michigan‚ Huron‚ Erie and Ontario) are the largest surface freshwater system on the Earth. They form a great part of the American and Canadian physical and cultural heritage. They form 84% of America’s fresh water and about 21% of the world’s surface fresh water‚ providing water for consumption‚ energy‚ transportation and recreation. One of the biggest problems to these lakes is sediment toxins caused by such factors as industrial and municipal discharges‚ sewer overflows
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River Systems The Amazon is the longest river in the South America. It originates in the Peruvian Andes‚ and flows approximately 6‚ 450km (4‚ 000 miles) to its mouth in the Atlantic Ocean. It is the world’s second longest river. No other river approaches its volume of flow‚ which exceeds that of the world’s 10 next largest rivers‚ combined. Another large river system in South America is that of Parana‚ Paraguay and Uruguay rivers‚ the waters from which empty into the Plata estuary. The Parana
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to gravity‚ the precipitation flows over the ground as surface runoff. A portion of runoff enters rivers in valleys in the landscape‚ with streamflow moving water towards the oceans. Runoff‚ and ground-water seepage‚ accumulate and are stored as freshwater in lakes. Not all runoff flows into rivers. Much of it soaks into the ground as
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References: [1] Allai A.‚ Bojariu R.‚ Diaz S.‚ Elgizouli I.‚ Griggs D.‚ Hawkins D.‚ Hohmeyer O.‚ “Climate change 2007: Synthesis Report”‚ Intergovermental Panel on Climate Change‚ Rep. Nov. 12 – 13‚ 2007. [3] Beeton AM (2002). Large freshwater lakes: present state‚ trends‚ and future. Environ Conserve 29(1):21–38. [4] Barron O.‚ Silberstein R.‚ Ali R.‚ Donohue R.‚ McFarlane D.J.‚ Davies P.‚ Hodgson P.‚ Smart N.‚ Donn M.‚ ”Climate change effect on water development ecosystems in South
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Coral Reef Bleaching Coral reef bleaching‚ which is the whitening of diverse invertebrate taxa. The cause of the whitening is “from the loss of symbiotic zooxanthellae and/or a reduction in photosynthetic pigment concentrations in zooxanthellae residing within the gastrodermal tissues of host animals.” (P.W.Glynn) The reason why coral reef bleaching is such a concern is because the “consequences of bleaching large numbers of reef-building scleractinian corals and hydrocorals.”(P.W.Glynn)
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Chapter 25 Control of Body Temperature and Water Balance PowerPoint Lectures for Biology: Concepts & Connections‚ Sixth Edition Campbell‚ Reece‚ Taylor‚ Simon‚ and Dickey Lecture by Edward J. Zalisko Copyright © 2009 Pearson Education‚ Inc. Introduction: Chilling Out Bears sleep a lot during winter But bears do not hibernate Instead‚ they become dormant – Body temperature drops from 37°C to 31–34°C – True hibernators may cool to 30°C Dormant bears – Are easily awakened – True
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Ocean which contains most of the water on Earth. Why are we in a drought despite promising facts? The reason is despite an abundance of water on Earth‚ we have access to merely one per cent of all the water on the Earth’s surface. The rest of the freshwater is hidden in ice caps or somewhere deep underground. The remaining salt water which is 97.5% of the water on Earth can have the salt removed but‚ the process is costly and challenging.
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The zebrafish (Danio rerrio) is belonging in Cyprinidae family. It is the largest freshwater fish family and vertebrate animals. This family is common called minnows or craps family. The minnow’s family has about 3032 species and 371 genera. Some of the key characteristics to define this family are toothless jaws‚ teeth in throat only‚ cycloid scales‚ single soft-rayed dorsal fin and a pair of abdominal pelvic fins. They also have large eye‚ scaleless head and body with conspicuous scales. The mouth
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Laboratory 10 & 11: Stimulated Diving and Heart Rate Prelab Questions: 1.) If the peripheral blood vessels were constricted without making any other further adjustments in the cardiovascular system then the blood vessels could potentially burst due to the built up pressure and no further decrease in heart rate. The vessels would be smaller due to the constriction but the heart would continue to pump the blood with the same or greater force. The dive response prevents this from happening
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