Preview

Discuss the Degree to Which the Theory of Plate Tectonics Is Supported by the Distribution of Seismic Activity Across the Globe.

Good Essays
Open Document
Open Document
942 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Discuss the Degree to Which the Theory of Plate Tectonics Is Supported by the Distribution of Seismic Activity Across the Globe.
Plate tectonic theory is a widely excepted theory that the Earth’s lithosphere is made up of plates, both oceanic and continental, which slowly move due to convection currents in the mantle and the asthenosphere. However, it is very hard to be certain as we can’t see the structure of the Earth, so some people do not agree with it. This theory saw the introduction of what we know today to be tectonic plates. Tectonic plates occur where there is radioactive decay in the core and temperatures are extremely high. This decay can occur anywhere in the earth’s core. This results in a plume of magma rising through the mantle creating a thermal current. When this current reaches the surface it spreads through the asthenosphere, before cooling and sinking. These are the convection currents which move tectonic plates. Convection currents will only occur in liquid form and in warm conditions. Tectonic plate theory has evidence to prove that these currents do take place. We know that the mantle is liquid and has high temperatures as magma that originates in the mantle is molten. This means that convection currents can occur. This part of plate tectonic theory is supported by global seismic activity because if convection current did not exist and plates were not able to move, earthquakes would not occur at any plate boundaries, but particularly at collision plate boundaries as there would be no plate movement.
Another part of tectonic theory, which came before the suggestion of plates, is palaeomagnetism which was first discovered in the 1960s. It was suggested that approximately 400,000 years the Earth experienced reverse polarity. This means that the magnetic north and south poles swap direction. This was backed up by evidence which involved ferrous rich rocks such as magnetite under the Atlantic Ocean. These rocks are found on the sea floor on either side of the Mid-Atlantic Ridge and are formed when solidified magma broke through the lithosphere at the Mid-Atlantic Ridge

You May Also Find These Documents Helpful

  • Good Essays

    As a result, the mantle becomes less dense and will gradually rise closer to the lithosphere. The cooler, denser mantle then begins to subduct back down closer to the mantle thus replacing the rising, less dense mantle. This process of events creates a convection cycle throughout the mantle. This rotating movement causes the lithospheric plates to move.…

    • 653 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Chapter Two Geology

    • 1338 Words
    • 6 Pages

    PLATE TECHTONIC THEORY:The lithosphere that is broken into plates move on earth’s surface relative to one another. Zones of volcanic, E.quake mark most plate boundaries.…

    • 1338 Words
    • 6 Pages
    Good Essays
  • Powerful Essays

    Earthquakes are an example of seismic activity caused by the build-up of tension at the three types of plate boundaries: destructive, constructive and conservative. The pressure is suddenly released as the plates jerk past each other, sending out seismic waves from the focus that travel through different parts of the earth. The movement of convection currents within the Earth’s mantle causing the crust to become mobile which creates the different types plate margins, makes the cause due to physical factors. However human activity is suggested to be the cause of some minor earthquakes, for instance the building of large reservoirs where the water stresses the surface rocks or the subsidence of deep mine workings.…

    • 2230 Words
    • 9 Pages
    Powerful Essays
  • Good Essays

    Plate Tectonics Theory

    • 470 Words
    • 2 Pages

    Plate tectonics theory, which is the modern theory of the motions of Earth’s layer, explains how geological features, such as mountain ranges, continents, and bodies of water move and form. An important aspect of plate tectonics theory is that the outer layer of the earth is divided into plates which move across the earth’s surface. “These plates move relative to each other, typically at rates of 2-4 inches per year. As the plates move, they interact along their boundaries” (Plate Tectonics). In other words, the formation of geological features occur at the plate boundaries which is where plates slide and interact. There are four types of plate boundaries: divergent boundaries, convergent boundaries, transform…

    • 470 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    The moon, mars, and earth all have plate tectonic movement, however, they all are active in different ways. The earth probably has the most tectonically advanced system. Tectonic plates are any one of the internally rigid crustal blocks of the lithosphere that move horizontally across the earth's surface relative to one another (Answers.com).…

    • 236 Words
    • 1 Page
    Satisfactory Essays
  • Good Essays

    Plate Tectonics

    • 791 Words
    • 4 Pages

    2. What directions do the plates move relative to one another in a divergent plate…

    • 791 Words
    • 4 Pages
    Good Essays
  • Good Essays

    Earthquakes develop in the crust of the earth. The inner parts contains a lot of energy. Some of this energy can escape through cracks which can cause volcanic activity, but most of it is stored within the earth’s inner part, contained in the crust.The earth’s outer crust has rough edges and lines making it look a bit like a jigsaw puzzle.The energy stored here causes the pieces to slide, glide, knock and move around each piece. These pieces are also known as tectonic plates.…

    • 514 Words
    • 3 Pages
    Good Essays
  • Good Essays

    No wonder that this idea, developed in the 1960s but based on years of research that preceded that era is described as "the unifying theory of geology”; therefore, I do not think that plate tectonic theory should be discounted because it is just a theory, since it revolutionized the way geologists view Earth. Plate tectonics is the unifying concept of geology, it also revitalized the field of geology by providing a new perspective from which to interpret many old ideas. Finally, plate tectonics explains nearly all of Earth's major surface features and activities. These include faults and earthquakes, volcanoes and volcanism, mountains and mountain building, and even the origin of the continents and ocean basins.…

    • 115 Words
    • 1 Page
    Good Essays
  • Satisfactory Essays

    Plate Tectonics Theory

    • 418 Words
    • 2 Pages

    How does the plate tectonics theory help explain the existence of fossilized marine life in rocks atop the Ural Mountains? Be sure to include a description of the specific process(es).’…

    • 418 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Plate tectonics can help us understand the distribution of earthquakes and volcanoes very easily, it is recorded that main earthquake and volcanic zones are clustered along plate boundaries and more powerful ones are near destructive and conservative plate boundaries.…

    • 337 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Hot Spots

    • 340 Words
    • 2 Pages

    During the 1960’s when plate tectonics were coming together, it explained the many new things and exposed many other magnificent ideas. This new scientific theory explained a number of mysteries like the movements of continents, form of the ocean floor, mountain chains, volcanoes, earthquakes, and how ancient life was sorted over time. Determining the behavior of the Earth’s crust, from plate tectonics, it made it easier for Geologist to focus more on the strange things that happen below the Earth’s surface.…

    • 340 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    The idea of a lithosphere system is divided into three parts, inputs, processes and outputs. The input is the ideas, information and the resources of the system. The main core of the system is the Earth's inner core which contained radioactive minerals during the creation of Earth few billion years ago. It continuously produces large amount of heat due the massive energy within the core and the temperature is about 1000 Celsius. This core will create "process" which is the action taken of this material. The "process" will be the lava flowing through below the Earth's surface. There are lots of "output" to the "process" and earthquake is one of them. When the lava moves below the Earth's surface, it moves the Teutonic plates but if the movement pattern is suddenly disturbed and changed then the plates will crash to each which creates Earthquake. The lava also continuously removes the old layers of the Earth's crust by flowing through it. Once the old layer is removed, then there will be a new layer of crust created by the cooled lava. Volcano eruption is another effect because the lava below is very pressurized since they are moving continuously, and once the pressure is too high then it will find a proper way to release it by spitting lava through the crust. lava movement is also moving all the continents slowly, so theoretically the continents will once join back together but that will be many years later. Lithosphere basically contains all the rock elements that created the Earth, starting from the first layer crust to the…

    • 306 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    plate tectonics theory

    • 447 Words
    • 2 Pages

    Plate tectonics is the theory that the outer rigid layer of the earth is divided into a couple of dozen plates that move around across the earth's surface relative to each other, like slabs of ice on a lake. Plate Tectonics is cause by convection currents in the mantle of the Earth. This theory was originally called continental drift. The theory of “Pangea” that is the continents were connected was Alfred Wegener. The age of the sea floor is one good piece of evidence that very adequately supports the theory of plate tectonics. The Ocean floor is around 160 million years old while the crust of the earth is around 3.8 billion years old. Another example is that the shapes of many continents are such that they look like they are separated pieces of a jig-saw puzzle. The fact that they are so properly shaped to fit together causes the plate tectonic theory to be properly supported by it. There is also large amount of seismic, volcanic, and geothermal activity along the conjectured plate boundaries. The concentration is striking, and indeed this plot serves to define the plate boundaries extremely well. The plotted earthquake and volcanic activity on the physiographic chart of the sea floor can be seen to follow along the plates, very few were far away from the plates. The earthquakes that were not close to the plate boundaries, like the one in England, was weaker and can be attributed to other reasons such as reduced weight stress from the melting of once glaciers that covered the area. The movement of the continents over a long period of time is measurable and has been done by many geologists. Another example is how there are ridges, such as the Mid-Atlantic Ridge where plates are separating that are produced by lava welling up from between the plates as they pull apart. Likewise, there are mountain ranges being formed where plates are pushing against each other such as the Himalayas, which are still growing.…

    • 447 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Air and Earth

    • 1135 Words
    • 5 Pages

    The movement and separation of continents and Earthquakes are a result of plate movement. They are the sudden release of energy built up when plates do not move smoothly past one another…

    • 1135 Words
    • 5 Pages
    Good Essays
  • Good Essays

    essay of nothing

    • 376 Words
    • 2 Pages

    Another key part of the plate techtonics theory is how the plates move. Despite seismic action showing that the movement must be present as it is caused by the friction this does not help when determining how the plates move. This relies on the convection currents which occurs in the mantle and neither seismic nor volcanic activity will help to prove this theory.…

    • 376 Words
    • 2 Pages
    Good Essays

Related Topics