As an alternative, the crust tends to collapse and is pushed upwards or at times sideways. Mason and co-workers inwho did not find, though, an explanation for these data in terms of sea floor spreading, like Vine, Matthews and Morley a few years later.
Plate tectonics, or plate movements, have changed the way geologists think about the Earth. When the plates force a high amount of pressure on each other, its causes earthquakes, volcanoes to erupt, and the formation of mountains.
This also explains the evidence of glaciers in the Sahara Desert. Development of the theory Summary Detailed map showing the tectonic plates with their movement vectors. Some volcanoes occur in the interiors of plates, and these have been variously attributed to internal plate deformation  and to mantle plumes.
The vectors show direction and magnitude of motion. Combining poles of different ages in a particular plate to produce apparent polar wander paths provides a method for comparing the motions of different plates through time.
Plates and processes involved in earthquakes and volcanoes in India: This distortion was recognized by Icelandic mariners as early as the late 18th century. Tectonic lithosphere plates consist of lithospheric mantle overlain by one or two types of crustal material: More important, because the presence of magnetite gives the basalt measurable magnetic properties, these newly discovered magnetic variations provided another means to study the deep ocean floor.
This type of lava is not very viscous due to its low silica content. Describes the theory of plate tectonics and how the theory has changed the way geologists think about the Earth.
Details major plates and how the theory helps predicts earthquakes.
These are formed by the magma which fills the gap created by the divergent plates. Volcanic activity can occur at convergent or divergent plate margins, but it can also occur at hotspots in which no plate margin is involved.
Tracking the movement of the plates is often done by tracking the distance between two objects on different plates.
An example of this is the Mid-Atlantic ridge. During the late s it was successfully shown on two occasions that these data could show the validity of continental drift: The rupture area that forms a transform plate boundary is known as a transform fault found in the ocean basin.
Coats of the U. But without detailed evidence and a force sufficient to drive the movement, the theory was not generally accepted: Plate tectonics have helped to make sense of Earth's movement.
Dietza scientist with the U. This process is known as sea floor spreading. The result is a slight lateral incline with increased distance from the ridge axis. The crust in excess disappeared along what were called the oceanic trenches, where so-called "subduction" occurred.
Hess therefore concluded that the Atlantic Ocean was expanding while the Pacific Ocean was shrinking. Along the edges of these plates there is a large occurrence of geologic activity.
Around that time a super continent Pangea started split into different land masses and move apart in different directions. Mantle convection For much of the last quarter century, the leading theory of the driving force behind tectonic plate motions envisaged large scale convection currents in the upper mantle, which can be transmitted through the asthenosphere.
However, transform faults are those regions where occasional earthquakes have occurs. For Geysers to form, you need three things, heat, water and a plumbing system.
When the continents and oceans move about the surface, it is similar to passengers on a raft.
Therefore, Heezen advocated the so-called " expanding Earth " hypothesis of S. This theory has helped scientists to predict many large Earthquakes. Describes the theory of plate tectonics and how the theory has changed the way geologists think about the Earth.
This theory explains not only about how ancient crust is destroyed along destructive plate margins, but it also explains how new ocean floor is created. This allows geologists to see how far the plates have moved towards or away from each other.
Conversely, the Western banks of South America show evidence of convergent plate boundary, where the plates are pushing and moving towards one another, in this case the Nazca and South American Plates. These ideas, which find their roots in the early s with the so-called "fixistic" ideas of the European and Russian Earth Science Schools, find resonance in the modern theories which envisage hot spots or mantle plumes which remain fixed and are overridden by oceanic and continental lithosphere plates over time and leave their traces in the geological record though these phenomena are not invoked as real driving mechanisms, but rather as modulators.
Plate Tectonics Essay Words | 3 Pages. A plate tectonic is defined as a solid rock mass that builds up the Earth’s surface.
The plate tectonic theory is a theory that geologists use to help explain the surface processes and events. The theory of plate tectonics Essay Sample. To begin with we can see that many of the landmasses appear as separated jigsaw pieces with their complementary shaped coastlines.
One example of this is how the North Western coastline of Africa could quite easily ‘slot. “Evaluate how plate tectonics theory helps our understanding of the distribution of seismic and volcanic events” (40 marks) The theory of plate tectonics was first introduced by Alfred Wegener in The theory of seafloor spreading is only focusing on the movements under water, and the theory still cannot find the evidence of the power source.
After having better understanding the activities of volcanoes, earthquakes and terrestrial magnetism, the theory. Jul 31, · A middle school lesson on plate tectonics theory for grades #KAtalentsearch.
Evaluate how plate tectonics theory can help our understanding of the distribution of seismic and volcanic events (40 marks) Plate tectonic theory suggests that the earth’s crust is made up of 8 main plates, as well as many other smaller ones.Plate tectonic theory essay