Roman poet Lucretius, intellectual heir to the Greek atomists, believed its formation must have been relatively recent, given that there were no records going back beyond the Trojan War.
The plates are rigid. Their boundaries are marked by earthquakes and often by volcanoes. Where plates collide and overlap, young mountains, arcs and trenches are the boundaries. Sudden movement of the earth crust can be noticed during earthquake.
Some parts of the land surface of New Zealand were raised by about 3 metres during the earthquake of Similarly, some areas of Japan sank by about 6 metres during earthquake.
Recently, during the earthquake ofthe bed of the Brahmaputra River had been raised leading to various changes in the valley. Interior of the Earth: To know exactly about the interior of the earth is more difficult than that of taking photograph of other planets with the help of satellites or by walking on the surface of the moon.
It has not been possible till today to collect direct evidences about the structure of the earth. However, geographers and geologists have collected indirect evidences about the structures and composition.
On the average, the radius from the centre to the surface of the earth is km but, the deepest mine in the world in South Africa is about only 4 km deep and man could dig up to a maximum depth of 6 km in search of oil.
The knowledge beyond this limit is based primarily on indirect scientific evidences. The indirect evidences are based on temperature and pressure inside the earth, density of materials and behaviour of earthquake waves. On the basis of the different scientific observations it has been concluded that there exists different layers inside the earth.
The hot and molten lava, ash, smoke that come out at the time of volcanic eruption as well as the hot water springs are some of the evidences which confirm that interior of the earth is having a very high temperature.
Actually, this was the view earlier that the crust of the earth is floating on a massive molten materials. But, the study of earthquake waves has indicated that the temperature does not increase uniformly from the surface to the centre of the earth.
The rate of increase in temperature is not uniform. Scientists also have proved that the main reasons of increase in temperature are the fusion of radio-active materials and other chemical reactions.
The tremendous pressure from the overlaying materials makes the melting point higher. Therefore, the earth behaves mostly as solid down to a depth of km because of tremendous pressure.
By studying the speed and path of earthquake waves, temperature and pressure conditions inside the earth, scientists are of the opinion that the physical properties, density and composition of the materials are different at varying depths.
The structure of the earth is therefore layered. The earth consists of three layers, one inside the other like an onion. They are the crust, the mantle and the core. The topmost layer of the earth is solid, the thinnest, and the lightest and is known as Lithosphere. The lithosphere has again two layers-outer part immediately below the newer sedimentary formation, popularly known as crust and the inner part of greater strength.
The crust of the earth is composed of sedimentary and granitic rocks. The inner layer of lithosphere has basaltic and ultra-basic rocks. While the outer layer of lithosphere is found mainly under continents, the inner layer is found partly under oceans.
The average density of lithosphere is 2. The average thickness is 8 to km. Below this top layer is the layer of basalt rock which is heavier than the topmost layer. The density varies from 3. It assumes the properties of solid and partly plastic materials.
The average thickness of this layer is to km. The SIMA also has two layers—Inner silicate layer at the top with average thickness of to km and Transitional zone of mixed metals and silicates with an average thickness of to km.
Finally, the innermost layer exists at the central core of the earth with density 5. It is composed of the heaviest mineral materials.It would also conserve energy and natural resources, reduce air and water pollution, and green house gases. Recycling, although a small act has a huge effect on the Earth.
Recycling can also have an effect on your reputation as an individual and the community you live in. Recycling can show others that you are kind and care about the Earth. Essay figure earth. Earth Essay Example for Free A survey of a city would useful words for narrative essay be computed as though the Earth were a essay figure earth surface the size of the city.
Essays on Earth The earth is the only planet known to man where life exists and we are the proud owners of such a precious planet.
Earth essay is popular in schools and colleges and is aimed to improve a sense of responsibility to earth that sustains all life. Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study.
The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied. The water vapour makes the Earth, when seen from outside, into a brilliant shining orb, as you can see in Figure 1.
Figure 1. Earth taken from the Apollo 17 spacecraft in The Earth is the third planet from the Sun and comes between the planet Venus and the planet Mars.
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