write a brief note on the various spheres of the earth
Answers
The four spheres show how the four main components of Planet Earth form a complete system. These main components are land, air, water, and life.
The lithosphere, also known as Geosphere is made of the earth's core, the mantle, crust, ocean floor,mountains, sand, rocks, alphalt, bricks, etc.
The hydrosphere is made of everything water such as oceans, rivers, lakes, rain, snow, and ice caps.
The atmosphere is made of gasses such as oxygen, hydrogen, water vapor, ozone, and the wind.
Finally the biosphere is all that has life such as plants, animals, people, insects, microbes, etc.
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Answer:
The planet Earth constitutes of many spheres. The spheres can be abiotic or biotic. The biotic spheres exist in earth is biosphere and abiotic spheres are lithosphere, atmosphere and hydrosphere.
The biosphere is the layer in which life exists. The human, plants and trees exist in the biosphere. Lithosphere, hydrosphere and atmosphere are the subsets of the biosphere.
The lithosphere is the solid outermost layer of the earth. It is the solid surface where we live, plant trees and constructs buildings.
Hydrosphere is the liquid part of the earth. It includes an ocean, sea, lake, etc. Life also exists in the hydrosphere such as fish and other water bodies.
The atmosphere is the layer in which the air is being available. Air is the most essential thing in life. The air that we breathe and carbon dioxide that plants consume are available in an atmospheric layer.
There are two types of layers for the planet earth namely outer and inner. The interior of the Earth has three different layers namely the crust, the mantle and the core.
The Crust
The crust is the outermost layer of the earth. It is the skin of the earth. It is the solid and rigid part of the earth. The plants and trees exist on the crust. It extends from 5km to 30km. The thickness of the crust is greater below the continents than the oceanic floor.
The Mantle
Interior part beneath the crust is known as Mantle. It extends up to 2900 km thick. The major elements found in the mantle are Silica (Si) and Magnesium (Mg), hence it is popularly known as SIMA. In the upper part of the mantle the rock remains solid and inner part of the mantle the rock remains in liquid form.
The Core
The core is the innermost layer of the earth which is just below the mantle. It is composed of minerals of Nickel (Ni) and Iron (Fe). Hence it is popularly known as NIFE. There are two types of core, namely solid outer core and Liquid inner core. Since there is a large amount of iron in the core, it is responsible for Earth's Gravitational Force.
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