Consider the following statements regarding 'Dykes': 1. They are saucer-shaped structures. 2. They are formed when lava solidifies almost perpendicular to the ground. 3. They are rarely found in the Deccan Traps region. Which of the statements given above is/are correct?

Correct Option The correct option is 2 only Explanation Volcanic landforms are classified into extrusive and intrusive forms based on where the magma cools. Intrusive landforms are created when magma cools within the Earth's crust. Dykes are a specific type of discordant intrusive igneous rock formation. Statement-wise Analysis - Statement 1 is Incorrect: When magma forces its way through cracks and fissures in the existing rock, it may solidify almost perpendicular to the ground. These vertical or near-vertical, wall-like structures are known as dykes. - Statement 2 is Correct: Saucer-shaped, concave-to-the-sky intrusive bodies are known as Lapoliths. Dykes are characterized by their wall-like, vertical structure, not a saucer shape. - Statement 3 is Incorrect: Dykes are commonly found in the Deccan Traps region, particularly in Western Maharashtra. They are widely considered to be the feeders for the massive volcanic eruptions that formed the Deccan Traps flood basalts. Key Takeaway: Dykes are vertical, wall-like intrusive volcanic landforms formed perpendicular to the bedding planes, whereas Lapoliths are saucer-shaped and Sills are horizontal sheet-like intrusions.

NCERT Class 11 Geography — Chapter 2: Interior of the earth

mcqeasy

Consider the following statements regarding 'Dykes':

They are saucer-shaped structures.
They are formed when lava solidifies almost perpendicular to the ground.
They are rarely found in the Deccan Traps region.

Which of the statements given above is/are correct?

Official previous-year question

Verified 1 Aug 2026.

Options

A1, 2 and 3
B2 only
C1 and 3 only
D1 only

Did you get this right?

Solution

Correct Option

The correct option is

2 only

Explanation

Volcanic landforms are classified into extrusive and intrusive forms based on where the magma cools. Intrusive landforms are created when magma cools within the Earth's crust. Dykes are a specific type of discordant intrusive igneous rock formation.

Statement-wise Analysis

Statement 1 is Incorrect: When magma forces its way through cracks and fissures in the existing rock, it may solidify almost perpendicular to the ground. These vertical or near-vertical, wall-like structures are known as dykes.
Statement 2 is Correct: Saucer-shaped, concave-to-the-sky intrusive bodies are known as Lapoliths. Dykes are characterized by their wall-like, vertical structure, not a saucer shape.
Statement 3 is Incorrect: Dykes are commonly found in the Deccan Traps region, particularly in Western Maharashtra. They are widely considered to be the feeders for the massive volcanic eruptions that formed the Deccan Traps flood basalts.

Key Takeaway: Dykes are vertical, wall-like intrusive volcanic landforms formed perpendicular to the bedding planes, whereas Lapoliths are saucer-shaped and Sills are horizontal sheet-like intrusions.

Your note

More from Chapter 2: Interior of the earth

With reference to 'Body Waves', consider the following statements: 1. They are generated due to the release of energy at the focus. 2. They move only in a vertical direction towards the surface. 3. They interact with surface rocks to generate surface waves. Which of the statements given above is/are correct?

easy

Which of the following statements is correct regarding the 'Shadow Zone' of P-waves?

medium

With reference to the 'Mantle', consider the following statements: 1. The lower mantle is in a liquid state. 2. It extends from Moho's discontinuity to a depth of 2,900 km. 3. It has a lower density than that of the crust. Which of the statements given above is/are correct?

medium

Consider the following statements regarding the 'Crust': 1. It is the innermost solid part of the earth. 2. It is brittle in nature. 3. Its thickness varies between oceanic and continental areas. Which of the statements given above is/are correct?

easy

With reference to the sources of information about the interior of the earth, consider the following statements: 1. Mining and drilling projects provide direct information about the earth's interior materials. 2. Meteors are considered a direct source of information because they originate from the earth's core. 3. Gravitation and magnetic fields are indirect sources of information. Which of the statements given above is/are correct?

medium

Keep practising Chapter 2: Interior of the earth

Work through every question from this NCERT chapter.

Browse all NCERT Class 11 Geography chapters

Correct Option

The correct option is

2 only

Explanation

Statement-wise Analysis

Statement 1 is Incorrect: When magma forces its way through cracks and fissures in the existing rock, it may solidify almost perpendicular to the ground. These vertical or near-vertical, wall-like structures are known as dykes.
Statement 2 is Correct: Saucer-shaped, concave-to-the-sky intrusive bodies are known as Lapoliths. Dykes are characterized by their wall-like, vertical structure, not a saucer shape.
Statement 3 is Incorrect: Dykes are commonly found in the Deccan Traps region, particularly in Western Maharashtra. They are widely considered to be the feeders for the massive volcanic eruptions that formed the Deccan Traps flood basalts.