Origins and Characteristics of Mid-Oceanic Ridges Matthew Olson ABSRACT The theory of seafloor spreading emerged with the discoveries of Harry Hammond Hess. Ocean basins are expanding laterally away from a mid-oceanic ridge. Radioactive decay in Earth’s mantle causes convection cycles‚ which drive plate tectonics. Hot mantle rises and undergoes decompression melt due to change in pressure. New oceanic crust is created in a characteristic sequence. Studies of Ophiolites show a sequence
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Questions 14-17 Reading Passage 162 has four sections A-D Choose the correct heading for the each section from the list of headings below. Write the correct number i-vi in boxes 14-17 on your answer sheet. ___________________________________ List of Headings i Causes of volcanic eruption ii Efforts to predict volcanic eruption iii Volcanoes and the features of our planet iv Different types of volcanic eruption v International relief efforts vi The unpredictability of volcanic eruption
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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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Joe Garcia PTAC-1308 Energy Conservation It would be hard to imagine a life without the use of energy. So many of the products that we use on a daily basis are powered because of electricity‚ which in turn is generated because of energy. American’s use a mixture of different energy sources to cool and heat our homes‚ offices‚ and means of transportation. We also use energy sources to illuminate and power these same places. Oil has provided the United States with less than 50% of energy needs
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"If we truly want an innovative and creative renewable fuel industry‚ then it needs to be challenged. And if we create a set of protections that allow it to not be as creative and innovative as possible‚ then we aren’t doing a service to the industry or to the people of this country."- Jimmy Carter‚ April 18th‚ 1977. The threat to the environment has been a persisting issue for more than just a few years. Yet‚ only now is when the public has been made aware of the certain "complication". Luckily
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A volcano is a rupture on the crust of a planetary mass object‚ such as the Earth‚ which allows hot lava‚ volcanic ash‚ and gases to escape from a magma chamber below the surface. Earth’s volcanoes occur because the planet’s crust is broken into 17 major‚ rigid tectonic plates that float on a hotter‚ softer layer in the Earth’s mantle.[1] Therefore‚ on Earth‚ volcanoes are generally found where tectonic plates are diverging or converging. For example‚ a mid-oceanic ridge‚ such as the Mid-Atlantic
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consists of the parts of the solid earth‚ hydrosphere and atmosphere in which living organism can be found. System- a group of interactive or interdependent parts that form a complex whole. Magma- molten material that forms inside the Earth Igneous rocks- the result of crystallization or freezing of magma (molten material) Sediment- Material (such as gravel‚ sand‚ mud‚ and lime) that is transported and deposited by wind‚ water‚ ice‚ or gravity; material that is precipitated from solution;
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melted into material in the mantle which I shot and sticky. This is called a destructive plate boundary. This material then comes up through the volcano‚ and solidifies‚ making a cone shaped volcano. The vent often blocks itself up with residue magma‚ so the magma builds up until the volcano can’t withstand the pressure. Eruptions are violent. Mt St Helens exploded sideways. The eruption caused a massive debris avalanche‚ reducing the elevation of the mountain’s summit from 9‚677 feet (2‚950 m) to 8‚365
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We filled you in with the first set of 36 fascinating facts that every gamer should know about Minecraft in parts one through four‚ and now we have finally returned with part five! This computer-based digital fantasy world has been reaching record levels of popularity since its release in only 2011‚ and we are here to give you the full scoop on everything there is to know! Read on to discover our next set of nine facts! Stay tuned for our coming articles‚ parts six through 12‚ where we reveal the
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Lab one is designed to determine fifteen sediment samples average grain size‚ sorting by size and mineralogy‚ rounding‚ sphericity‚ and Quartz/Feldspar/Lithic content as well as minerals present in each sample. In order to view the sample a stereoscope and light source is required. On the base of the stereoscope there is an insert that can either be black on one side and white when flipped to the other side. This insert can make viewing light or dark color samples easier due to the inserts backdrop
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