Impacts from Space and Mass Extinction Events A. Understand the concept of a biosphere and Earth System Science and that the biosphere has evolved over time. -Mass extinction: a crisis that affects life right across the planet from the deepest oceans to the highest mountains -Biosphere: all life on Earth is a part of the biosphere‚ a thin layer of life that exists on the surface of the planet and that interacts with the hydrosphere (oceans‚ lakes‚ and rivers)‚ the atmosphere‚ and the lithosphere
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Waleed Smith AP Human Geography June 4th‚ 2015 Why Geography Matters More Than Ever Why Geography matters a book written by Harm de Blij a Dutchman born in Schiedam‚ Netherlands October 9‚ 1935. Mr. Harm received his Phd in geography from Northwestern University in Illinois‚ served as editor of several “National Geographic Magazine” articles‚ and was a renowned professor at Michigan State University. As a child‚ he moved from Europe to Africa to avoid the rising Nazi threat. While in Africa he
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human history. Debatable evidence has indicated that some of the early people may have reached America by makeshift boat‚ or arrived through travelling by foot. For these early humans to travel by foot‚ the continents once had to be connected. The Pangaea theory is the imaginary landmass that existed when all the continent were joined about 300-200 million years ago. The main connection between the continents was the Bering Strait. The Bering Strait‚ also known as the ‘Land Bridge’‚ connects Eurasia
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up of dense and mostly solid silicate rock * Lithosphere is the uppermost layer (100km thick) * Asthenosphere is the layer below the lithosphere (100km -660km) * Crust is thin silicate rock material on top 3. Pangaea is the proposed supercontinent that 200 million years ago supposedly began to shift apart and form our present continents. Alfred Wegener proposed this theory along with continental drift; Evidence he used includes matching fossils‚ rock types‚ and
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rise‚ cool and fall back down. This circular motion causes the plates‚ which float on the mantle‚ to move. In 1912‚ Alfred Wegener‚ a German meteorologist‚ was the first man to state that the continents were once joined in a super continent called Pangaea‚ conversely he couldn’t explain why and what happened to cause the plates to move apart. He based his theory on the extraordinary fit of the South American and African continent coastlines. Notably the eastern edge of South America and the western
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Continental drift is the movement of the Earth ’s continents relative to each other. The hypothesis that continents ’drift ’ was first put forward by Abraham Ortelius in 1596 and was fully developed by Alfred Wegener in 1912. However‚ it was not until the development of the theory of plate tectonics in the 1960s‚ that a sufficientgeological explanation of that movement was found. |Contents | | [hide] | |1 History
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an area Crust-contains land and ocean floor (50-70 km); solid Mantle-2867 km; solid Lithosphere-crust and uppermost part of the mantle; solid Asthenosphere-soft layer within the mantle Outer core-2‚266 km; liquid Inner core-1‚216 km; solid Pangaea-“super continent”‚ when all continents were connected Subduction-when one continental plate slides under another‚ at a deep-ocean trench Deep-ocean trench-a place in the ocean where subduction occurs Mid-ocean ridge-a place in the ocean where new
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Rosemary Hurrey EAS-101-OL009 10 July 2013 Written Assignment 1 Answer the following questions. 1.Summarize advances over time in determining the age of the Earth‚ including the importance of the discovery or radioactivity. Throughout the past few decades‚ there have been advancements in new techniques to help determine the age of the Earth. Currently scientific evidence believes that the Earth is between 4.5 and 4.6 billions years old. To help determine the age of the earth‚ radiometric dating
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the continents either side of the Atlantic Ocean seemed to nearly fit together. In 1912 Alfred Wegner published the theory of continental drift suggesting that the continents used to be joined together in an ancient supercontinent which he named Pangaea. He then proposed that it later split in to two continents- Laurasia in the north and Gondwanaland in the south‚ which further split forming our current continents and at some point these land masses had drifted apart to their current positions on
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fossils for the same plant or animal on opposite sides of the globe and had wondered how they had traveled from one side to the other. To explain all this‚ Wegener developed the theory that all the continents were once part of a supercontinent called Pangaea. He published these theories in a book called The Origin of Continents and Oceans. His book gained popularity‚ and soon everyone agreed that continents moved up and down‚ not sideways. This
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