zone When 2 continental plates collide. Neither plate is forced under the other‚ nor so both are forced up and form fold mountains. Composite volcano Composite volcanoes are made up of alternating layers of lava and ash (other volcanoes just consist of lava). They are usually found at destructive or compressional boundaries. Cone They are the build-up of rock from the volcanic vent; it piles up in the shape of a cone with a central crater. Conservative plate boundary a plate boundary where the relative
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In this essay I will tell you about the main parts of a volcano and it’s origin. The first main part I will tell you about is the magma chamber. A magma chamber is a large pool of molten rock‚ also called magma‚ sitting underneath the Earth’s crust. The magma chamber can be more than three miles below the Earth’s surface and the magma waits there for the pressure and gases to become too much to stay stable. The magma in the magma chamber is less tense than the mantle surrounding it‚ so it moves toward
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example of a regular volcanic eruption caused by a ‘Hawaiian’ Volcano is Kīlauea which has been continuously erupting since January 1983‚ and has causes no loss of life. Looking at the proprieties of the magma explains why eruptions along subduction plate boundaries product more ‘hazardous’ eruptions‚ and this is one of the reasons that a volcano becomes more hazards because the more viscous a material is the more pressure build up will occur within the volcano‚ causing more explosive eruptions. Explosive
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Chapter 4 plate tectonics Need a Hint? 1.What evidence proved that South America‚ Africa‚ India‚ and Australia were once covered by glaciers? glacial deposits and rock surfaces scarred by glaciers 2. What happens when an oceanic plate converges with a continental plate? The denser oceanic plate slides under the less dense continental plate. 3. A divergent boundary is a boundary between two plates that __________. Move away from each other. 4.Do two colliding continental plates always
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place to visit. The spectacular island is the second largest in Europe and located between the Greenland Sea and the Atlantic Ocean. It sits on a constructive plate boundary; the violent tug of war between the two plates causes Iceland to gradually get bigger. Iceland is the most volcanically active place in the world‚ due to tectonic plate activity. Disruptive eruptions occur about every five years. The most recent eruption of Eyjafjallajokull in April 2010‚ caused havoc both internationally and
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An Introduction to Structural Geology Introduction Structural geology is the study of the features formed by geological processes. Features include faults‚ folds and dipping strata. Geologists can work out the order of events and see which events are related by taking fairly simple measurements and using simple methods. Measurements and Techniques The most obvious thing to do when trying to decipher the structural history of a formation is to describe it. One way of doing this is to measure the dip and strike
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Plate Tectonics Plate Tectonics The theory of plate tectonics was developed in the 1960’s and states that the earth is broken into a number of shifting plates. Plate tectonics also provides geology with a comprehensive theory of how the earth’s crust moves. In this essay I will explain the different types of plate movements‚ how the plates move and how this movement affects earthquakes and volcanoes. To begin‚ there are three different types of plate movement; divergent boundaries‚ convergent
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separated or slipped from the metaphysis.1 The germinal cells of the growth plate remain with the epiphysis‚ and the calcified layer remains with the metaphysis. (Physeal Injuries) Type I fractures occur most commonly in the distal tibia and fibula‚1 but are uncommon in the wrist‚ accounting for only 8.5% of all Salter-Harris fractures. (Ped.Distal) Upon examination‚ and athlete will be point tender over the growth plate which warrants a referral to an orthopedist.1 On an x-ray‚ there is soft tissue
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The legend of Atlantis‚ the lost continent described in a story written by Plato around 360 B.C.‚ has inspired heated speculation for many centuries. In modern times‚ public interest in the subject has been accompanied by imaginary proposals that stretch Atlantis well beyond the boundaries of Plato’s story. Nowadays‚ it’s quite difficult to distinguish Atlantis facts from Atlantis fiction. The documentary by the History channel called “Atlantis: Searching for the Lost World of Atlantis” starts
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of Northridge in 1994 that occurred along one of the San Andreas’s larger secondary faults. The San Andreas Fault is a conservative boundary between two major plates of the Earth’s crust: the Pacific to the south and west and the North American to the north and east. The Pacific plate is sliding laterally past the North American plate in a northerly direction‚ and hence the San Andreas is classified as a strike-slip fault. The annual rate of movement has been 4 to 6 cm per year since the early
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