how is lithosphere formed ?
Answers
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Answer :-
As the earth cooled, there was no atmosphere to trap the heat. The surface cooled off fast due to the cold temperature of space (like how the top of coffee cools off when exposed to the air). This created a layer of cooled rock that solidified into the crust. Differences in magma created two types of the lithosphere, oceanic and continental, characterized by the basalt in oceans and granite in the continents. The lithosphere changes its depth. Underneath continents, the lithosphere is deepest and the roots of mountain ranges go down tens of miles (like an iceberg, there is more underneath). The compositions of each type of crust change at plate boundaries, where new rocks are formed from common minerals in both crusts or one is metamorphosed into other rocks. Oceanic lithosphere becomes very dense due to eclogite near subduction zones and so it plunges below the light continental crust into the mantle.
ANSWER
Lithosphere is a layer in which we all live including plants , animals , microorganisms etc.
The upper layer of earth is madeup of solid rocks and sand.
It is not a smooth surface but has high mountains , plateaus or highlands , low plains , deep valleys and very deep basins i.e. oceans.
Many of these features are shaped by wind and water.
Once the earth was hot and in liquid form. Later due to several processes , it turned hard and rocky outside with sand and mud.
As the earth's interior continued to cool , it contracted and the outer crust wrinkled forming ridges i.e. mountains and basins i.e. lower areas which became oceans later.
In this , the present phase of Earth has formed gradually with many modifications.