How the granite is formed
Pubdate:5/31/2015 SundayCategory:Science Popularization

Granite is the Major Nature Building Block of Tianzhushan Landscape

The type of rock dominating the Tianzhu Mountain is monzonitic granite with medium grain, 128 million years old.

Granite is a common type of igneous rock widely-occurring on the Earth. It is called an intrusive igneous rock as it forms when magma from deep underground intrudes into the crust and cools. The depth of the formation of granite is usually from 5 to 30 kilometers below the Earth’s surface, so it is named plutonic rock.

 

Magma from deep underground intrudes into the Earth’s crust.

Magma cools and then granite mass forms.

The Earth’s crust uplifts, exposing granite mass.

Granite is made up of three most important minerals: quartz, feldspar and mica. It is a hard, crystalline rock, which is very resistant to erosion.

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