Geography
Study the picture. Identify the rocks formed in case of A, B and C. Give reasons to support your answer.
Rocks
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Answer
A — Rock A is Extrusive Igneous rock. This is because it is located on the surface of the Earth, where lava has flowed out through fissure and solidified.
B — Rock B is a Dyke. This is because magma when forced upwards fills vertical cracks or fissures in existing rocks. It then hardens there to form dykes.
C — Rock C is a Sill. This is because magma flows between layers of rocks horizontally and then hardens there. This layer of intrusive rock is called Sill.
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Describe how igneous rocks are formed. State their main characteristics.
Give a reason for each of the following:
(i) Igneous rocks also called the primary rocks.
(ii) Igneous rocks are used by builders and sculptors.
(iii) Sedimentary rocks are called secondary rocks.
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