The event and record of plate tectonics
The event and record of plate tectonics
Plate tectonics originates from two words and phrases; plate and tectonic. Plate in geological terms means that a significant slab of very hard rock at the same time tectonics in Greek implies’ to build’. Therefore’ plate tectonic may possibly be defined as how the earth’s builds on transferring the plate. It might even be well-defined as the section of the Earth’s lithosphere that is definitely rigid moves distinctively from individuals encompassing it (Rodger, 1993).
Idea of plate tectonics states which the lithosphere on the earth is crafted up of specific plates that fragmented into a number of great and minor items of dependable rock. The plates transfer upcoming to one another on top of the reduced mantle to build numerous forms of plate borders which have formed the Earth’s landscape about a multitude of several years. (Oreske & Legrand, 2001).
Alfred Wegener, a populous meteorologist, is known to be the founder in the plate tectonic principle. He noticed which the coastline of East South America and that with the west coast of Africa seemed to fit together in a jigsaw manner like to form a bigger plate. He then proposed an idea that all plates (continents) connected to a single large plate called Pangaea which gradually began to drift apart through 300 million several years ago (Rodger, 1993).
More scientific research on the plates’ coastline revealed that all the plate of earth’s continent somehow fit together. The principle, commonly known as continental drift theory, and Wegener became the founder for the principle on which scientist have based on their research.site
However, Alfred Wegener plate tectonics concept could not ascertain how exactly the continents drifted away from just about every other. He proposed the earth’s rotations and the centrifugal forces towards the equator as one within the possible mechanism for continental drift. He said that Pangaea started at South Pole and earth’s rotation finally caused it to break up, sending continents toward the equator. His theories were discarded by the scientific community (Rodger, 1993).
Arthur Holmes, (1929), a British geologist, came up with the principle of thermal convection to explain the gradual drift in the Earth’s continents. He based on heating and cooling cycle in the Earth’s mantle that caused the continents to go. The Wegner’s idea being borrowed by scientist community in their quest for earth’s shape.
Today scientist have researched and analyzed past pieces of evidence and findings by geologist and scientist to expound and come up with a better ways of explaining plate tectonic concept and forces that were behind the drifting with the plates. It is believed and proofed using geological evidence that earth’s plate at one time was one big supercontinent called Pangaea. Due to three main driving forces namely, mantle convection, gravity, and the Earth’s rotation led to the drifting away with the a lot of plate from the main one. A number of major plates (continents) formed which include North America, South America, Eurasia, Africa, Indo-Australian, Pacific, and Antarctica.
Expounding on the three main driving forces for the movement of the Earth’s tectonic plates; Mantle convection is the most extensively studied technique of tectonic plate movement. It was widely discussed by Holmes in 1929, in his concept. The major convection current of molten material in the Earth’s upper mantle produces a lot of energies which is transferred to lessen mantle. The cheaper mantle material finds their way to the crust causing the embedded rock to transfer away and out from the ridge thus transferring the plate. Evident of this is present in mid-ocean ridges.
Gravity evidenced by the mid-ocean ridges where the elevation is higher than the bordering ocean floor. Convection currents within the Earth cause lessen mantle material to rise and spread away from the ridge, causing the older material to flow toward the ocean floor due to gravity and aid in the movement with the plates. Then lastly earth rotation is caused by centrifugal forces as the earth rotates (Oreskes $ Legrand, 2001).
Plates make different sorts on the boundaries as they interact with their movement. Some in the boundaries established include the Divergent boundaries form when a plate breaks along certain lines of weakness and transfer away from each other forming a new crust, for instance, Mid-ocean ridges. The other boundary is called Convergent boundaries and created when two plates collide with one another causing the sinking of one plate below the other. Transform boundaries forms at the location where new crust created and without destroying it.
Today, through research, scientists have come up with shreds of evidence proving that earth plates were once super plate that split into the current Continent. One with the evidence is the jig-saw fitting for the East coast of South America, west coast of Africa appear to fit into one another. Also, Fossils remains of plants and animals collected by scientist around the world showed similarities that were cumbersome to explain unless continents had once joined. For instance, Cynognathus was a land reptile; its Fossils remain present both Africa and South America. Thus proving that the two continents joined as one, millions of decades ago, (Oreskes $ Legrand, 2001). Scientists have also found out from the evidence of earthquakes happened continually and occurred along certain lines, near the boundaries between tectonic plates.
As Wegener’s ideas form the basis why the landscape for the earth is the way it is, scientist community has advanced the methodology of studying the plate tectonic concept currently. They use the satellite to study evidences of plate tectonic where they position it a wide range of kilometers away from the earth surface. From the satellite statistics, it is evidenced that the plates go linearly and away from every single other at the speed of 10mm to 100mm per year. Thus proving that plate tectonic idea that could be earth was once one plate that gradually drifted apart greater than millions of several years back to form the current continents.