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Minerals And Rocks
Question
What is an igneous rock? Describe the method of formation and characteristics of igneous rock.
Solution
Igneous rocks are those rocks which have been formed by the cooling and solidification of molten natural matter of the earth.
The igneous rocks are formed when magma cools and turns into solid forms. The process of the cooling and solidification can happen in the earth's crust as well as on the surface.
Characteristics of igneous rocks are described below :
(i)These rocks do not have particles and layers.
(ii)These rocks are compact and massive.
(iii)These rocks are crystalline.
(iv)The igneous rocks are extremely hard and resistant.
(v)These rocks do not possess fossils of plants or animals.
(vi)These rocks are thermal in origin.
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Some More Questions From Minerals And Rocks Chapter
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.
The process of physical and chemical changes affecting sediments during their conversion into solid rocks.
Structure in metamorphic rocks in which minerals are drawn out into long, thin pencil like objects all in parallel alignment.
The smooth planer surfaces of weakness along which minerals have pronounced tendency of split.
Few large crystals imbedded into material of smaller crystals.
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