Asthenosphere

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  • Solar System Research Paper

    that those minerals in the inner core are solid and the same minerals in the outer core are liquid. The subsequent layer is the mantle which is sitting on top of the outer core. This layer is by far the thickest layer of Earth. Similar the core, the mantle contains mostly iron but in the form of silicate rocks. The mantle can also be divided into two portions, the upper mantle and the lower mantle. The lower mantle is completely solid since the pressure is too excessive for it to melt and flow. The upper mantle is also known as the asthenosphere, which flows as convection currents. Convection occurs in all fluids and is the rising of warm particles and sinking of cool particles. This convection flow of the asthenosphere has a large impact on Earth 's lithosphere, the outermost layer of the planet. The lithosphere contains both the crust and a small portion of the upper mantle. The lithosphere is very rigid; it does not flow like the asthenosphere. The crust itself, which is contained in the lithosphere, can also be divided into two parts, the continental crust, and the oceanic crust. The continental crust is composed mostly of granite unlike the oceanic crust which consists of a volcanic lava rock called basalt. Basaltic rocks of the ocean plates are much denser and heavier than the granitic rock of the continental plates. Lying above the lithosphere is the liquid hydrosphere, containing 71% of the Earth 's surface. Finally, the Earth 's atmosphere is a thin layer of gases…

    Words: 787 - Pages: 4
  • Outline Alfred Wegener's Hypothesis

    5. Define lithosphere and asthenosphere. Lithosphere is the solid outermost part of the planet where we live on. It consists of the brittle upper portion of the mantle and as well as the crust. There are two different types of lithosphere which are oceanic lithosphere and continental lithosphere. The continental lithosphere is made up of igneous and sedimentary rock. It is 7-10 kilometres thick and makes up 40 percent of the Earth’s surface. The oceanic lithosphere is made up of mafic and…

    Words: 642 - Pages: 3
  • Hawaiian Island Emperor Seamount Chain Case Study

    approximation. Also ridges usually contribute to two plates at the same rate, then sometimes a means of separation rate (v/2) is given instead of the current separation rate (v). 10. According to the theory of plate tectonics, the Earth's crust consists of at least a dozen of rigid plates that move at your own pace. These blocks resting on a layer of warm and flexible, rock called the asthenosphere, which flows slowly by way of hot tar. Geologists still have not determined exactly how these two…

    Words: 1722 - Pages: 7
  • Algebr Personal Narrative

    Algebra 2 In my life I had a lot of memories good ones and bad ones.The best memory I can come up with is when I was little and every summer my family went to Mississippi. We would go swimming, and family members houses and just see a lot and eat a lot. One of the years we had went I almost drowned by jumping into the middle of the pool at our hotel and not knowing how to swim. But what made the best memory was just seeing my whole family together and that I just like being down south, for the…

    Words: 786 - Pages: 4
  • The Pros And Cons Of Plate Tectonics

    Geologically, we can divide the outer core of the earth into two parts which are lithosphere and asthenosphere. Lithospheric shell contains a number of major breaks which can be referred as plate boundaries. Lithosphere sits on Asthenosphere, which is the portion of the mantle, causing the plates to move around as its solid and ductile properties. When we think about the movements of plate tectonics, we generally come up with the idea of dramatic natural disasters which destroy and derive…

    Words: 1475 - Pages: 6
  • Why Volcanoes Are Formed

    Instruct the students that convection currents in the asthenosphere travel to the surface of the Earth, where it breaks apart the plates at “spreading centers”, and as the plates separate the constantly streaming magma cools when it reaches the surface creating new ocean floor. Stress the fact that due in a large part to the volcanic activity, the new ocean floor moves away from the crests on both sides of the boundary. Further explain that when two tectonic plates are moving away from each…

    Words: 1052 - Pages: 4
  • Alfred Wegener's Theory Of Continental Drift Theory

    Wegener’s idea was being revived. Continental drift became possible when the crust is not fixed mechanically on earth surface. Furthermore, ocean floor’s ocean age also suggested displacement of continents as the ocean floor grow and spread. Harry Hess and Robert Dietz, in 1960, both simultaneously suggested a similar hypothesis of how features of the ocean floor and the fit of the continents could be explained. Their radical ideas were as below (Garrison, 2009): a.) Convection currents…

    Words: 1161 - Pages: 5
  • Juan De Fuca Ridge Case Study Essay

    continental crust. Some of the oldest sea floor can be found in the Mediterranean as it hasn’t been subsided in this region. The oldest sea floor is often found in places where rifting has stopped. 2 4 Heat Flow Models As it was realized that the heat flow was is highest at spreading ridges and then decreases with distance, the relationship between age and heat flow became the primary constrain for most oceanic models.
Common for the oceanic heat flow models discussed in this paper, are that…

    Words: 720 - Pages: 3
  • Galapacanic Evolution

    landscapes into a high chain of mountains, diverging oceanic floors create underwater ridges. Diverging plate boundaries spread plates due to the outward movement, contributed by the upwelling coming from forces originated in the mantle and asthenosphere. The water–magma (lava) interaction, and the diverging and converging forces help in the formation of underwater mountain chains called mid-ocean ridges (Christopherson and Birkeland 340,…

    Words: 1422 - Pages: 6
  • Why Do Earthquakes Occur?

    forth by Alfred Wegener. The entire earth rests on these plates, as shown by the picture to the left, and the constant friction between is the primary cause of earthquakes, volcanoes, oceanic trenches, mountain range formation, and many other geologic phenomenons. How these deformations manifest themselves on the earth depends on how the interaction of two plates occurs at their boundaries. Each type of plate movement, divergent, lateral and convergent, generates distinct geologic processes and…

    Words: 729 - Pages: 3
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