Tectonics and Continental Drift Past and Present Locations Abstract When we look at our earth’s surface now it has seven continents‚ and five of them are divided by the oceans that surround them. In 1912 Alfred Wegner (1880-1930)‚ came up with a theory called the continental drift; stating that over three hundred years ago all seven continents were once one super continent called Pangaea. Wegner tried to convince other scientists and geologist for many years that the continents
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relief elements on the solid surface of the earth and briefly explain their deposition in relation to the plate tectonics concept. Have you ever wondered where mountains come from‚ why there is a sea floor‚ island arcs or even volcano and what plate tectonic have to do with this? Well worry no more as all your question on the earth’s surfaced topographic relief elements and plate tectonics are about to be answered. The first question that might come to mind is what is a relief? A relief is a land
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Introduction The Caledonian orogeny happened during the late Silurian to early Devonian periods. This was due to the westward subduction of Baltican plate beneath the Laurentian margin. The continent to continent orogeny resulted in a over thickened crust. During the Palezoic orogeny several different processes were at work simultaneously‚ which included erosion‚ plate divergence‚ gravity driven collapse of the orogenic wedge‚ and viscous flow of the lower crust. The double set of extensional shear zones
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Earthquakes and Logarithms Earthquakes are responsible for a wast majority of natural hazards on our planet. This natural geological phenomena are almost impossible to predict‚ and they occur usually in zones of the planet that are prone to movement in the uppermost crust of the earth. Certain areas are more likely to experience earthquakes‚ and also the aftermath of the earthquakes can be just as destructive or sometimes even more. Different methods of measuring earthquakes have been implemented
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an hour. 3. FORMATION OF THE SWISS ALPS The Swiss Alps are a mountain range formed by the convergence and collision of the European and African tectonic plates approximately 100 million years ago. As a result of this collision‚ the Tethys Ocean basin gets pushed upward by the African tectonic plate and into the Eurasian tectonic plate. The bottom of the Tethys Sea experiences enormous pressures‚
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inside. As the liquid moves‚ the crust moves with it‚ the tectonics plates move with it‚ causing the continents to move with it too. Figure 1: Supercontinent Pangaea PROOF Among
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ridge. Radioactive decay in Earth’s mantle causes convection cycles‚ which drive plate tectonics. Hot mantle rises and undergoes decompression melt due to change in pressure. New oceanic crust is created in a characteristic sequence. Studies of Ophiolites show a sequence of sediment‚ pillow basalts‚ sheeted dikes‚ and gabbro being formed as hot mantle rises and creates new crust at ridges. The theory of plate tectonics is greatly supported by discoveries made at mid-oceanic ridges. INTRODUCTION
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has been slowly accumulating. The earth is made up of tectonic plates these are massive slabs of rock floating on magma ‚as the plates move about‚ they spread apart‚ collide‚ or slide past each other‚ This is the main cause of volcanoes and earthquakes Earthquakes occur in many regions all over the world in some regions they occur more frequently and severely than in others (depending on the location)‚ the main cause of earthquakes is tectonic plates grinding against each other ‚ therefore earthquakes
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Plate tectonics are responsible for many of Earth’s natural occurrences. From volcanoes to earthquakes plate tectonics play are large role. Another natural occurrence that is not is discussed as much as volcanoes and earthquakes is the formation of sedimentary rock. Plate tectonics also plays a major role in the formation of this type of rock. Plate tectonics is a term that is used to describe how the different plates that make up the Earth move and the reactions that occur as they are moving
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Quiz 4 1. The idea proposed by Alfred Wegener to explain the continental shapes and positions is known as _____. A) Pangaea B) plate tectonics C) continental drift D) rift valley E) sea floor spreading 2. In the diagram below‚ which two are the best examples of different continental positions in the past? A) North America – South America B) North America – Africa C) South America – Asia D) Europe – North America E) South America – Africa 3. According to Wegener’s model‚ what evidence
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