Consider the following information:
Landforms : Description
1. Laccoliths : large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below.
2. Lapolith : Massive igneous intrusion that is bowl-shaped/saucer shaped.
3. Sill : Vertical bodies of the intrusive igneous rocks.

Which of the pairs given above is/are correctly matched?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Question

Consider the following information:
Landforms : Description
1. Laccoliths : large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below.
2. Lapolith : Massive igneous intrusion that is bowl-shaped/saucer shaped.
3. Sill : Vertical bodies of the intrusive igneous rocks.

Which of the pairs given above is/are correctly matched?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

ONLiNE UPSC · Accepted Answer

Pair 1 is correct: Laccoliths are large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below.
Pair 2 is correct: A lapolith is a type of igneous rock formation that forms when lava moves upwards and spreads out in a horizontal direction along weak spots in the Earth's crust. It develops into a saucer-shaped structure, with the concave side facing upwards.
Pair 3 is not correct: The horizontal bodies of the intrusive igneous rocks are called sill or sheet, depending on the thickness of the material. The thinner ones are called sheets while the thick horizontal deposits are called sills.

Geomorphology

Types of Intrusions (Laccoliths, Lapolith, Sill)

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M Question 1	⏱ 0
Consider the following information: Landforms : Description 1. Laccoliths : large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below. 2. Lapolith : Massive igneous intrusion that is bowl-shaped/saucer shaped. 3. Sill : Vertical bodies of the intrusive igneous rocks. Which of the pairs given above is/are correctly matched? (a) 1 and 2 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3