STD 7 SOCIAL SCIENCE CHAP-9 PRUTHVINI ANTARIK RACHANA
Earth's interior structure and landforms
The inner part of the earth or subsoil
Rocks and minerals
Formation of land-forms
River work
Samuddhamoja's work
Ice River Work
Work of wind
STD 7 SOCIAL SCIENCE CHAP-9 PRUTHVINI ANTARIK RACHANA
Igneous and sedimentary rocks are transformed into metamorphic rocks due to high temperature and extreme pressure. Such rocks are called 'metamorphic rocks'.
Examples: Clay turns into slate and limestone into marble.
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What is 'fossil'? The remains of dead plants and insects buried in rock layers are called 'fossils'.
rock wheel
In some situations, one type of rock is metamorphosed into another in a cyclical manner. This process of transformation from one rock to another is called rock cycle.Liquid magma cools to solid igneous rock. These igneous rocks migrate in small pieces from one place to another to form the igneous rock.
Temperature and pressure cause this igneous and igneous rock to change into metamorphic rock. Due to extreme temperature and pressure, this metamorphic rock remelts and becomes liquid magma. This liquid magma cools again and turns into solid igneous rock.
STD 7 SOCIAL SCIENCE CHAP-9 PRUTHVINI ANTARIK RACHANA
Rocks and Minerals
Rocks are very useful for us.Solid rocks are used to make roads, buildings and structures. Rock is made up of different minerals.
A mineral is a naturally occurring substance with definite physical properties and definite chemical composition.
Minerals are very important to mankind.
Some minerals are used as fuel. Such as coal, natural gas, mineral oil and petroleum.
It is also used in various industries and in making medicine. Like, Iron, Aluminum, Gold, Uranium etc.
STD 7 SOCIAL SCIENCE CHAP-9 PRUTHVINI ANTARIK RACHANA
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