Question

Q. “It is a large body of magmatic material that cools in the deeper depth of the crust moulds in the form of large domes. It appears on the surface only after the denudation processes eliminate the overlying materials.” The paragraph represents which volcanic landform:

• A. Batholiths
• B. Laccoliths
• C. Phacolith
• D. Lopolith

Answer 1

The correct option is A Batholiths

Explanation:

Batholiths

• Batholiths are the cooled portion of magma chambers.
• It is a large body of magmatic material that cools in the deeper depth of the crust molds in the form of large domes.
• They appear on the surface only after the denudation processes eliminate the overlying materials.
• These are granitic bodies.

Laccoliths

• These are large dome-shaped intrusive bodies with a level base and linked by a pipe-like channel from below.
• It bears a similarity to the surface volcanic domes of the composite volcano, only these are located at deeper depths.
• It can be considered as the localized source of lava
• The Karnataka plateau is patterned with dome hills of granite rocks.

Lopolith

• When the lava moves upwards, a part of the same tends to move in a horizontal direction wherever it finds a weak plane.
• It can get rested in various forms. If it develops into a saucer shape, concave to the sky body, it is called lopolith.

Phacolith

• It is a wavy mass of intrusive rocks found at the base of synclines or the top of the anticline in the folded igneous country.
• These wavy materials have a definite outlet to source beneath in the form of magma cavities.