Chapter 10 A) Continental crust is lighter than oceanic crust. Continental crust is granitic. Oceanic crust is basaltic. Oceanic crust subducts under a less dense crust whether it's oceanic or continental. Continental crust does not subduct. Oceanic crust is much younger in geologic age than continental crust. Continental crust is on average thicker than oceanic crust. B) The lithosphere (crust and attached upper mantle) is less dense but hard and behaves as a brittle material and floats
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Exploring Taiwan---Taiwan Is Alive How does it feel like to live on a floating plate, unaware of probable earthquakes and tectonic movements? I understood how it feels like because I live in Taiwan! After an introduction to the geology of Taiwan, I found Taiwan a really active and dynamic island. This reminded me of an article I read on New York Times years ago; it titled: Taiwan Moves Closer to Mainland, Pulled by Forces That Molded Its Mountains. In the article, there were a research team
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Option 1 – Tectonic Activity and Hazards What are tectonic hazards and what causes them? 1. Introduction Tectonic hazards have to be distinguished from tectonic events. Hazards tend to refer to those events or items that pose a threat to humans and their lifestyle. Therefore, a tectonic hazard is one which involves tectonic processes being hazardous to humans. In the first part of my essay I will be explaining exactly what is meant by tectonic processes and will be referring to the relatively
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anomalies in the pattern of volcanic activity upon plate margins. They are often in the middle of plates. A hot spot can be described as a small area of the earth’s crust where an unusually high heat flow or plume is associated with volcanic activity. Of approximately 125 hot spots thought to have been active over the past 10 million years most are located well away from plate boundaries. It is the fact that they have posed so much trouble for plate tectonic theories, as they don’t fit with the general
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Continental drift, seafloor spreading and plate tectonics have many similarities. They also have many differences. Sea floor spreading is when new molten material comes up through the mantle onto the ocean floor. Continental drift is when the continents break apart and move. Plate tectonics is what the continents and ocean are on and moving on. Continental drift, seafloor spreading and plate tectonics are all related. Continental drift, seafloor spreading and plate tectonics are all similar in many ways.They
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sea-floor spreading, and plate tectonics have many similarities and differences. Continental drift is the theory that explains how the continents shift on Earth’s surface. Sea-floor spreading is the process where new sea-floor is created as molten material which rises in the from the Earth’s mantle. Plate tectonics is the theory at which the lithosphere is separated into different plates, and are moving along the asthenosphere. Continental drift, sea-floor spreading and plate tectonics all have similarities
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Sea floor spreading and plate boundaries are not a common subject to anyone outside of a scientific or marine biology lab. The purpose of this paper is to identify plate boundaries. Compare and contrast ideas behind plate tectonics and the theory of the continental drift. There are many types of plate boundaries. Each one is unique in its own way. Below three of the primary types are described in detail. There are several natural events that occur as a direct result of plate boundary interaction.
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shifting of tectonic plates. The energy release is a shock wave or seismic wave. The seismic wave is what causes the ground to move or shake, when this occurs we have a earthquake. According to the 2008 United States National Seismic Hazard Maps a lot of the west coast as far south as Hawaii, and north to Alaska has a lot of earthquake activity. The Pacific “Ring of Fire” (named for the large amount of active volcanoes), has a lot of tectonic activity. Tectonic plates are large plates of rock that
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Plate Tectonics Damian Neal EG 481 May 14, 2012 Instructor: Dr. M. Jiru Plate Tectonics Outline I. Revolution in Earth Science Continental Drift Hypothesis Sea-Floor Spreading: Clues and Processes II. The Plate Tectonic Model Motivating Observations Types of Plate Margins (Divergent and Convergent Margins) III. The Search for a Mechanism The Tectonic Cycle (the motion and influences
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a large supercontinent called Pangea. II. Aside from fossils and rock patterns there were other observations that led to his theory. A. "Glacial till deposits in the Southern Hemisphere aided Wegners hypothesis".("The supporting Evidence of Plate Tectonic Theory",2008) 1. Glaciation till is unsorted glacial sediment left behind by glaciers during the glacial drift. 2. "Glaciation in South America, Africa, India, and Australia is best explained if these continents were
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