Answer the following questions in about 150 words.
(ii) What do you understand by intrusive forms? Briefly describe various
intrusive forms.
Answers
Intrusive forms refer to the igneous rock body that is formed by the crystallization of magma within the crust of the Earth.
Various intrusive forms are :
- Batholiths
These are a huge mass of igneous rocks, usually of granite, formed due to cooling down and solidification of hot magma in the deeper depth of crust.
- Lacoliths
These are large dome-shaped intrusive bodies. They are connected by a pipe-like conduit from below with a level base.
- Lopolith
These structures are formed when the lava moves upwards, a portion of the same may tend to move in a horizontal direction. This happens where lava finds a weak plane.
- Phacolith
It refers to a wavy mass of intrusive rocks that are found at the bottom of synclines or near the top of the anticline in the folded igneous country.
- Sills
These are solidified horizontal lava layers inside the earth found near horizontal bodies of intrusive igneous rocks.
- Dykes
These are wall-like structures formed due to the cooling of lava through cracks and fissures developed in the land.
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