interior * Core: earth’s innermost zone. It’s extremely hot and has a solid middle surrounded by a liquid core of molten or semisolid lava * Mantle: thick zone surrounding the core. Mostly solid rock but under the outermost part lies the asthenosphere (hot‚ partly melted pile-able rock that flows and can be deformed like soft plastic) * Crust: outermost and thinnest zone of the earth. Consists of continental crust which underlines the continents and the oceanic crust which underlies the
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Plate Tectonics The forces that shape the earth begin beneath the lithosphere. Rock in the asthenosphere is hot enough to flow slowly. Heated rock rises‚ moves up toward the lithosphere‚ cools and circulates downward. Riding above this circulation system are the tectonic plates‚ enormous moving pieces of the earth’s lithosphere. [pic] Plate Movement Tectonic Plates move in four different ways. When tectonic plates come into contact‚ changes on the earth’s surface occur. 1. Diveregnt Boundary-
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tectonic plates made of? • Plates are made of rigid lithosphere. The lithosphere is made up of the crust and the upper part of the mantle. What lies beneath the tectonic plates? • Below the lithosphere (which makes up the tectonic plates) is the asthenosphere. Plate Movement • “Plates” of lithosphere are moved around by the underlying hot mantle convection cells Practical Exercise 1 Supercontinents! What happens at tectonic plate boundaries? Three types of plate boundary • Divergent • Convergent
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1. What is Earth’s mantle? The mantle is a part of a terrestrial planet or other rocky body large enough to have differentiation by density. The interior of the Earth‚ similar to the other terrestrial planets‚ is chemically divided into layers. The mantle is a layer between the crust and the outer core. ... 2. What elements make up the Earth’s mantle? Magnesium‚ silicon‚ iron and oxygen‚ aluminum‚ silicon‚ calcium‚ sodium and potassium 3. Describe the “big splash” theory of the Moon’s origin? The
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1. Summarize advances over time in determining the age of the Earth‚ including the importance of the discovery or radioactivity. Herodotus counted layers of earth near the Nile River in 450 B.C.E. The Bible was used in the Middle Ages to compute the age of the Earth. The 18th and 19th centuries brought a more scientific look into determining the age of the Earth by studying the salinities of the oceans‚ the rates of sedimentation‚ and models of cooling of different materials in order to calculate
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and facts were presented in the 2003 American disaster film The Core. First‚ the earth’s interior. We all know that the Earth is mainly divided into three parts: the crust‚ mantle‚ and core. The mantle is further subdivided into upper mantle‚ asthenosphere and the lower mantle based on seismic activity. We also know that the outer core is a rotating fluid while the inner core is a solid part. The movie was able to describe and explain these things accurately. It is also true that scientists have
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CONTINENTAL DRIFT THEORY In the early 20th century‚ German scientist Alfred Wegener published a book explaining his theory that the continental landmasses‚ far from being immovable‚ were drifting across the Earth. He called this movement continental drift. Wegener noticed that the coasts of western Africa and eastern South America looked like the edges of interlocking pieces of a jigsaw puzzle. He was not the first to notice this‚ but he was the first to formally present evidence suggesting
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Jaesung Lee Geography 1 Professor Thomas Orf Chapter 14 Questions 1) The first evidence Wegner was able to find was the remarkable number of close affinities of geologic features on both sides of the Atlantic Ocean. He found the continental margins of the subequatorial portions of Africa and South America fit together with jigsaw-on-like precision. He also determined that the petrologic records on both sides of the Atlantic show many distributions- such as ancient coal deposits-that would
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layer differs: The Earth has five major layers. * Inner Core: Solid most inner part of the earth. Composed of iron and nickel * Outer Core: Thick layer of magma with properties of liquid. * Mantle: Located beneath the crust. * Asthenosphere: Weak layer below the lithosphere with rock that acts as plastic and is easily deformed. * Lithosphere: Includes crust (oceanic and continental) and the upper
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erosion. ● Continental Plates (Crust)- consists of the continental crust‚ and the oceanic crust ● Mantle- solid rock‚ but under its rigid outermost part is a zone of very hot‚ partly melted rock that flows like soft plastic. The plastic is asthenosphere. ● Core- is very hot and has a solid inner part‚ surrounded by a liquid core of molten material Starting with the acceptance of the continental drift started the theory of plate tectonics. It is thought that plate motion produces mountains
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