and seismic events are major pieces of evidence towards proving that plate tectonics theory is valid.’ Discuss the extent to which you agree with this statement. (40 marks) Over the years proceeding the birth of the theory‚ increasingly convincing evidence has been gathered for proof of the theory of plate tectonics. In 1912‚ Alfred Wegner proposed the theory that continents are sat upon tectonic plates and that these plates are slowly drifting around the Earth (continental drift). Since then
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the three main types of plate boundaries. How do they work? How are they similar and different? There are three different plate boundaries. There is convergent‚ divergent‚ and transform boundaries. They all do different motions. Convergent boundaries are boundaries where the two plates are coming at each other or converging. Divergent boundaries are boundaries where two plates are moving away from each other or diverging. Transform boundaries are boundaries where two plates are shearing past each
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Where two tectonic plates converge‚ if one or both of the plates is an oceanic lithosphere‚ a subduction zone will form. When crust is formed at a mid-ocean ridge‚ it is hot and buoyant meaning it has a low density. As it spreads away from the ridge and cools and contracts‚ or becomes denser‚ it is able to sink into the hotter underlying mantle. When two oceanic plates collide‚ the younger of the two plates‚ because it is less dense will ride over the edge of the older plate. The density of the
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Plate tectonics is a scientific theory that describes the large-scale motions of Earth’s lithosphere. The model builds on the concepts of continental drift‚ developed during the first few decades of the 20th century. The geoscientific community accepted the theory after the concepts of seafloor spreading were developed in the late 1950s and early 1960s. The lithosphere is broken up into tectonic plates. On Earth‚ there are seven or eight major plates and many minor plates. Where plates meet‚ their
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Planetary Engineering: Mesozoic Tectonics Lesson 17 – Plate Tectonics 101 Introduction - Plate Tectonics = “Grand Unifying Theory” explaining relationships between processes within Earth From Theory of Continental Drift - Alfred Wegener in 1915 The Theory of Plate Tectonics 1) Earth’s surface consists of many lithospheric plates including crust (continental or oceanic) and immediately underlying mantle‚ cold and rigid 2) These plates are presently moving around on Earth’s surface and interacting
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mostly occur at plate margins. They can also occur at hot spots and in rift valleys. The most active volcanic zone is the Pacific Ring of Fire around the Pacific plate. Here plates are colliding or separating. At active points on these plates volcanic mountains are formed‚ e.g. Nazca Plate and South American Plate‚ where plates separate‚ e.g. Pacific and Nazca Plate and in rift valleys‚ e.g. African Plate‚ Kenya. The most active area on the globe is the western rim of the Pacific Plate - stretching
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Label the major plates onto your map of the world. Include arrows to show the direction each plate is moving. 2. Label the plates using the key below you map. 3. Identify the type of plate margin where the following plates meet (you may have to check your notes to complete this task) | |Collision |Conservative |Destrucitve |Constructive | |North American and the Pacific Plate |
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a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. In a 40‚000 km (25‚000 mi) horseshoe shape‚ it is associated with a nearly continuous series of oceanic trenches‚ volcanic arcs‚ andvolcanic belts and/or plate movements. The Ring of Fire has 452 volcanoes and is home to over 75% of the world’s active and dormant volcanoes.[1] It is sometimes called the circum-Pacific belt or the circum-Pacific seismic belt. About 90%[2] of the world’s earthquakes and 81%[3] of
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Patroklus takes Achilles’ armour and wears it into battle without his consent in fighting in it. He wanted to raise the spirits of the troops to get them fighting again since Achilles still wasn’t fighting due to the loss of Briseis. This resulted in the event of Patroklus being killed by Hektor in both sources because Hektor believed that he would be killing Achilles. This is a key similarity in both sources because‚ due to the loss of someone dear to him‚ Achilles returns to war with a mind of
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The theory of plate tectonics According to the generally accepted plate-tectonics theory‚ scientists believe that Earth’s surface is broken into a number of shifting slabs or plates‚ which average about 50 miles in thickness. These plates move relative to one another above a hotter‚ deeper‚ more mobile zone at average rates as great as a few inches per year. Most of the world’s active volcanoes are located along or near the boundaries between shifting plates and are called plate-boundary Volcanoes
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