Hess, Darrel and McKnight, Tom L. During this press release I will be describing the hazards associated with earthquakes in Los Angeles. The hypothesis of continental drift was largely developed by the German Alfred Wegener The edges of these plates, where they move against each other, are sites of intense geologic activity, such as earthquakes, volcanoes, and mountain building. The University of Wyoming has conducted such fieldwork on the different active and ancient areas of crustl and mantle changes. First I will go over the hazards associated with earthquakes in Los Angeles, origin and caused of earthquakes, the relation of earthquakes.
There are many different kinds of natural destroys hurricanes, tornados, tropical storms, and earthquakes. These long linear strips of magnetic anomalies form a symmetrical pattern either side of a spreading centre. One such thing that supports these two theories is that seen from space the continents look as if they might once have been joined together. However, earthquakes and volcanoes also occur within the plates rather than their edges, an example of which is the Hawaiian volcanoes that occur above a stationary hot spot beneath the Pacific plate. As terrible as Japan's recent earthquake was, the outcome could have been even more disastrous. Homogenous Cold Accretion is what built our Earth. How can you tell rocks on another planet apart? Wegener was one of the.
The plate tectonic theory is a theory that geologists use to help explain the surface processes and events. Scientists presume this is the fault that most likely ruptured because it is closest to the epicenter of the rupture. A seismic event is the transient motion and release of kinetic energy caused by sudden failure of the earth's crust, usually felt as shaking or tremors in the rock mass. A nickel-iron alloy mixture makes up the outer core, and the inner is almost all composed of iron. Being able to predict and live with these events is the task given to you as the future scientists. Magma is pushed up by convection currents.
The magma flows and helps move the plates away from each other to allow more crust to be created and to grow; this is called convection cells. They are responsible for many of the structures and features that exists in our planet. As the puzzle of plate tectonics and the movement of the Earth are better understood the quality of life on Earth will improve. Volcanoes are created when two tectonic plates collide in a convergent boundary. The three boundaries include divergent, convergent, and conservative boundaries. However, I will also look at other potential causes of these events, and some evidence that does not follow the theory that all these events are caused by plate boundaries. Earthquakes are caused by the release of built-up stress within rocks along geologic faults or by the movement of magma in volcanic areas.
This suggests that in the history of the Earth, these two land masses were once connected and through the movement of tectonic plates on the lithosphere via convection currents, the one land mass has been separated into different pieces, much like breaking up a jigsaw. Indeed, the oceanic crust makes up only 0. The stability of the Earth is not at all what we think it is. After having better understanding the activities of volcanoes, earthquakes and terrestrial magnetism, the theory of plate tectonics was introduced about 30 years ago. This is particularly true is the continental shelves are taken into account as the true edges of the land masses. Examination of the globe usually results in the observation that most of the continents seem to fit together like a puzzle Plate pp.
The plates measured around 50 miles, thickness of 25 miles on land and 4 miles thick under the oceans. Sorry, but copying text is forbidden on this website! It states that Earth is made up of two layers, the lithosphere. Music of the Earth: volcanoes, earthquakes, and other geological wonders. The plate tectonics theory is a combination of two other theories: continental drift and sea-floor spreading. Long ago, people thought that the Earth never changed.
To begin with we can see that many of the landmasses appear as separated jigsaw pieces with their complementary shaped coastlines. He claimed that all the continents were joined together at one point in time, and drifted apart gradually over millions of years. They can even be as tall as mountains that are on land, this process is known as convection. The Caribbean sits on its own little plate and is surrounded on three sides by the bigger North and South American plates. His attitude is one of an expert in the field who is talking down to those who do not agree with him, a perspective that makes his book believable but unlikely to convince people who do not agree with him on the subject. It showed that volcanoes, earthquakes, and other features were along the Pacific Ocean and ran along the continents edges for the most part.
A cross-section of the earth would reveal that it is surrounded by a thin outer crust that is about 10…… Bibliography Gallant, Roy A. Unlike often equally destructive severe weather events such as hurricanes and tornadoes, earthquakes can hit at any time. Mid ocean range or submerged mountain range. Discuss critically the arguments for and against this view, and present your own analysis of which is stronger. Transform boundaries result when two plates slide alongside each other creating fault lines but not actually increasing or decreasing overall crust material. 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.