Continental drift is a theory stating that the Earth’s continents have been joined together and have moved away from each other at different times in the Earth’s history. The theory was first proposed by Alfred Wegener in 1912. Whilst his general idea of continental movement eventually became widely accepted‚ his explanation for the mechanism of the movement has been supplanted by the theory of plant tectonics. However there was a problem in accepting this idea originally because Wegener had no convincing
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national conservation area was at the bottom of a deep ocean basin and the western coast of North America was in present day Utah. Around 542 million years ago‚ Paleozoic‚ the area was under a deep ocean. Thick deposits of sediment‚ about 9‚000ft‚ were lithified. This lithified sediment eventually formed limestone and other similar carbonate rocks. Preservation of marine invertebrate fossils provides evidence for a marine setting for the Paleozoic. Starting around 250 million years ago‚ the Mesozoic
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Science! ! P. 517 # 9‚ 10‚ 11‚ 12! ! 9. Why does the thickness of ocean floor sediments increase the farther they are from a ridge?! -Thickness of ocean floor sediments increase the farther they are from a ridge because when new rocks form at the ridge‚ old rocks move away from the centre and this rocks stack along the end of sediments which pile up for long time that creates thick sediments‚! ! 10. How does sea floor spreading explain the movement of tectonic plates?! - Sea floor spreading in
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rock type – Cliffs are made of glacial deposits of boulder clay which is eroded through abrasion and prone to slumping. This is more easily eroded than harder rocks such as chalk. * Narrow Beaches * Causes: * Flamborough Head stops sediment from the north replenishing. It is made of chalk which dissolves rather than making beaches. * Coastal defences. For example‚ at Mappleton which cause human erosion. * Powerful waves – A cause of the long fetch from the Arctic Ocean and
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Denudation Processes While volcanic activities are a mountain’s building process‚ denudation processes are trying to level them down. Denudation includes processes which removes rock debris and carrying them to a new location. These processes happen through gravity‚ wind‚ ice and water. In the Tongariro Volcanic Centre‚ winds are an effective denudation agent because the mountain top gales are frequent and severe. Winds can transport and deposit debris. They carry with them fine silts and sand
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Misty Sprout 5/3/2013 Smoky Mountains Most of the Smoky Mountains in the national park are sedimentary and were formed by accumulations of clay‚ silt‚ sand‚ gravel minor amount of calcium carbonate. The oldest of the sedimentary rock were formed during the Proterozoic Era about 800-545 million years ago. About 310-245 million years ago‚ the eastern edge of the North American tectonic plat collided with the African plate becoming part of a supercontinent. During one of earlier collisions‚ tremendous
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Introduction Carding mill Valley has a v shape valley and meanders. We are going to be to be taking measurements of velocity and discharge along the upper course‚ middle course‚ and lower course. The Bradshaw Model: The Bradshaw model is important to this controlled assessment because the Bradshaw Model is a geographical model which describes how a river’s characteristics vary between the upper course and lower course of a river. This coursework is underpinned through some key processes/concepts
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Tables 1 and 3 shows the measurements of the 10-meter stretch of Bear Creek that includes a pool and a riffle. The first table also shows the recorded time and weather in which our class collected the data during that particular day. The upper‚ middle‚ and lower transects are measured using meters. Each of the transects are first measured by width and then by depth on the: Left edge‚ mid-stream‚ and right edge. Then there is description on the substate and the site on both the upper and middle
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As geologists‚ we examine layers of sediment on the Earth’s surface to approximate the dates of past geologic time periods. Ah sediment as you know is material like sand‚ gravel‚ fossil fragments that is transported by natural processes like wind ‚ water flow or the movement of glaciers. So sediment is transported and then deposited and it forms layers on the Earth’s surface over time. We examine these layers to learn about different geologic time periods including when they began and ended. For
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Constructive Plate Boundary Definition: (Divergent boundary) - Where two plates move away from each other and new oceanic crust is formed. What is a Constructive Plate Boundary? At divergent plate margins‚ plates are moving apart and new lithosphere is being created. In the oceans‚ this has produced the mid ocean ridge system‚ which can also be described as a global range of underwater mountains. Well known ocean ridges include the Mid Atlantic Ridge‚ the East Pacific Rise‚ the Juan de Fuca
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