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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ALL You Have Viewed Too Many Free Essays, Term Papers, and Book Reports. Geologic Formation of Pennsylvania Geologic Formation of Pennsylvania Pennsylvania’s land started with the idea of plate tectonics and convection currents. The mantle of the Earth is hotter than the lithosphere, which causes materials to sink and eventually rise back up to the surface. These continents move towards or away from each other with convection currents. Then, during the Ordovician Period mountain building occurred. Convection currents that pulled the continents together formed the Appalachian Mountains. Subduction of materials causes volcanoes to form, and volcanoes eventually covered the water that left ash or Bentonite in the quarries today. Next, during the Cambrian and Ordovician periods North America still remained above the sea. Eventually weathering wore away the surface of the land, and erosion moved these sediments away. The sediments that were deposited formed limestone. Limestone is also called carbonates that are formed by chemical deposition. Limestone is made out of shells of marine animals and mineral particles and is deposited far offshore in warm areas. This formation later settles on the seafloor and turns back into rock. Mud was also deposited farther offshore creating silt and clay. These sediment particles created Martinsburg shale. At limestone, formed, rock, dolomite, tuscarora, shale, found, deposited, contains, ash, sandstone, quartz, ordovician, clay, bentonite, appalachian, together, slate, sedimentary, sand, rocks, quarry, period, mountains, mountain, martinsburg, feet, eventually, eastern, deposit, currents, convection, conglomerate, calcite, away, volcanoes, turns, tectonics, surface, silt, sediments, plate, original, offshore, mud, mineral, materials, mainly, later, land Word Count: 579 Acceptance_Essays American_History Anatomy_&_Physiology Animal_Science_&_Zoology Anthropology Architecture Art Astronomy Aviation Biographies Book_Reports Business Computers Creative_Writing Current_Events Economics Education Engineering English Environmental_Science Ethics European_History Film_&_TV Foreign_Languages Geography Government_&_Politics Health_&_Beauty History_Other Human_Sexuality Legal_Issues Marketing Mathematics Medicine Miscellaneous Music Mythology Philosophy Physics Poetry Political_Science Psychology Religion Science Shakespeare Social_Issues Sociology Speech Sports_&_Recreation Supernatural Technology Theater Theses_&_Dissertations

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