Which one of the following is the lowermost/innermost intrusive igneous rock?
- A.Laccolith
- B.Batholith
- C.Lopolith
- D.Phacolith
Correct answer
Explanation
The correct answer is B, Batholith. A batholith is the largest intrusive igneous body and forms deepest in the crust, so it lies lowest of all these forms.
When magma cools below the surface, it forms intrusive bodies. A batholith is a huge mass of magma, usually granite, that cools at great depth in the crust; it is often dome-shaped and becomes visible at the surface only after long erosion of the rocks above. The other forms are smaller and lie higher: they are fed by magma rising from below and spread between or along rock layers nearer the surface. Sills and dykes are the sheet-like forms of the same family.
A is wrong because a laccolith is a dome-shaped body with a flat base that forms near the surface and pushes up the layers above it. C is wrong because a lopolith is a saucer-shaped body that sags into a basin, but it is smaller and shallower than a batholith. D is wrong because a phacolith is a wavy body lying in the crests and troughs of folded rocks.
Exam tip: batholith deepest and largest; laccolith dome, lopolith saucer, phacolith wavy, sill horizontal, dyke vertical.
Practice Questions
View allBagram Air Base is located in
- A.Turkey
- B.Pakistan
- C.Afghanistan
- D.Israel
Show answer
Bagram Air Base lies in Parwan province of Afghanistan, about 60 km north of the capital Kabul.
Read the full explanation →Which one of the following statements is not correct?
- A.Position of the Sun, Earth and Moon in a straight line of 180° angle is known as syzygy.
- B.Syzygy conjunction causes solar eclipse.
- C.Syzygy opposition causes lunar eclipse.
- D.Syzygy conjunction occurs at the time of perihelion only.
Show answer
This statement is not correct, because conjunction happens at every new moon, about once a month, and has nothing to do with the Earth's closest point to the Sun.
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- A.High yield per hectare of sugarcane
- B.Higher sucrose content
- C.Long crushing season
- D.Most of the mills in the Peninsula are located mainly along the east coast
Show answer
This statement is not correct, because the peninsular sugar mills are concentrated mainly in Maharashtra and Karnataka, in the west and the interior of the plateau.
Read the full explanation →Which of the following statements is/are correct?
1. Visakhapatnam Port is a land-locked harbour.
2. Deendayal Port is a tidal port.
Select the correct answer using the code given below.
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
Show answer
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Read the full explanation →Weathering, mass wasting, erosion and transportation are indicators of which one of the following processes?
- A.Denudation
- B.Endogenetic process
- C.Diastrophism
- D.Mountain building
Show answer
Weathering, mass wasting, erosion and transportation together wear down and strip away the earth's surface, and this combined work is called denudation.
Read the full explanation →