Question

On the basis of occurrence, classify igneous rocks.​

Answer 1

Answer:

Igneous  rocks may be simply classified according to their chemical/mineral composition as felsic, intermediate, mafic, and ultramafic, and by texture or grain size: intrusive rocks are course-grained (all crystals are visible to the naked eye) while extrusive rocks may be fine-grained (microscopic crystals) or glass

Step-by-step explanation:

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Answer 2

On the basis of occurrence igneous rocks can be classified as :

1) Phaneritic : those rocks with large crystals and which can be seen by naked eyes are Phaneritic.

2) Aphanitic : those rocks with crystals too small are aphanitic.

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