Rocks are made up of individual solid substance called minerals. A rock as any natural mass of mineral matter that makes up the earth's crust. On the basis of the formation, rocks are classified into :
These rocks are formed by cooling, solidification and crystallization of hot and molten magma found below the earth crust. These are granular and crystalline rocks. These are also known as 'Primary or Ba'sic Rocks' because of the fact that these rocks were first to be formed and supply raw material for other types of rocks to be formed. No layering is found in these rocks and fossils are also not found. Nearly 90% of the crust is made up of igneous rocks. For example Granite Basalt Dolerite and Magetite
Rocks formed on the surface of the earth due to the erosion and depositon of igneous and metamorphi rocks are known as sedimentary rocks. Sedimentary rocks are found over about 75% area of the crust, but they contribute only 5% in the formation of the crust. These rocks contain fossils. On the basis of the nature of the sediments, sedimentary rocks are classified into :
Metamorphic rocks are formed due to complete alternation in the appearance and constitution of pre-exising rocks due to change in mineral composition and texture through temperature and pressuer. These are the hardest rocks and do not contain fossils.
Metamorphic rocks formed through the sedimentary rocks. (Meta - Sedimentary of Para - Metamorphic Rocks.)
Metamorphic rocks formed through the Igneous rocks. (Meta - Igneous or Ortho-Meta morphic rocks)
Metamorphic rocks formed by the further metamorphosis of metamorphic rocks.
Print media are lightweight, portable, disposable publications printed on paper and circulated as physical copies in forms we call books, newspapers, magazines, and newsletters. They hold informative and entertaining content that is of general or special interest. They are published either once or d →
History of United Nation The name "United Nations", coined by United States President Franklin D. Roosevelt was first used in the Declaration by United Nations of 1 January 1942. In 1945, representatives of 50 countries met in San Francisco at the United Nations Conference on International Organiza →
In 2009, an unknown programmer by the name of Satoshi Nakamoto put forward a whitepaper that proposed a creation of new form of digital currency - cryptocurrency. Cryptocurrency functions the same way as regular currencies do in that its used as a means of exchange, unit of account and a store of va →
Headquarter: New Delhi Function of the Organization: The Medical Council of India was established in 1934 under the Indian Medical Council Act, 1933, now repealed, with the main function of establishing uniform standards of higher qualifications in medicine and recognition of medical qualifications →
If you contribute your content to our site. Please mail us your content to firstname.lastname@example.org