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Minerals And Rocks
Question
Describe the natures and mode of origin of the chief types of rocks at the earth's crust. How will you distinguish them?
Solution
The chief types of rocks are as under:
(i)The igneous rocks - The igneous rocks form out of magma and lava from the interior of the earth. These are formed when magma cools and solidifies. These are hard in nature such as granite.
(ii)The sedimentary rocks - These rocks are formed by the sedimentation in the bottom of sea or lake transported by various exogenous agencies. The sedimentary rocks are soft in nature. Sandstone is the typical example.
(iii)The metamorhpic rocks: These rocks are formed under the action of pressure-volume-temperature changes. Metamorphism is a process in which already consolidated rock undergoes recrystallisation of materials within the original rock.
These rocks are crystalline in nature. Marble is one examples of the metamorphic rocks.
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Some More Questions From Minerals And Rocks Chapter
Name the different types of rocks.
What is lithification ?
What is the name of the scale on which the hardness of minerals is measured ?
What is a mineral ?
On what does texture of rock depend?
Write the examples of igneous rocks.
What is a sedimentary rock ?
Write some main sedimentary rocks.
Which important minerals are found in metamorphic rocks?
State one example of hard rock and soft rock.
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