Download App

Interior of the Earth — Geography STD 11 Humanities — Question

CBSE BoardEnglish MediumSTD 11 HumanitiesGeographyInterior of the Earth5 Marks
Question
Answer the following question in about 150 words:
What do you understand by intrusive forms? Briefly describe various intrusive forms.
✓

Answer

Intrusive forms are an igneous rock body that forms from crystallised magma under the Earth's surface. Some of the major intrusive volcanic forms are following:
  • Batholith: Batholith is the largest intrusive form made by solidification of the molten lava within the earth. These are granitic bodies. Batholiths are the cooled portion of magma chambers.
  • Laccoliths: Laccoliths are large dome-shaped intrusive bodies with a level base. The Karnataka plateau is spotted with domal hills of granite rocks.
  • Lopolith: Lopolith is a large igneous intrusion, which is lenticular in shape with a depressed central region. It develops into a saucer shape, concave to the sky body.
  • Phacolith: Phacolith is a pluton parallel to the bedding plane or foliation of folded country rock.
  • Sill: Sill is a tabular sheet intrusion that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock.
  • Dike or dyke: Dike or dyke is a sheet of rock that formed in a fracture in a pre-existing rock body.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Long Answer questions (5 Marks)" from Interior of the Earth→Interior of the Earth — all question types→Geography STD 11 Humanities question papers→CBSE Board STD 11 Humanities question papers→CBSE Board question paper generator→

Similar questions

Answer the following question in about 150 words:
What are the evidences in support of the continental drift theory?
→
Answer the following question in about 30 words:
Briefly explain the indirect sources of information of the interior of the earth other than those of seismic activity.
→
Answer the following question in about 150 words:
Bring about the basic difference between the drift theory and Platetectonics.
→
Answer the following questions:
What are bio-geochemical cycles? Explain how nitrogen is fixed in the atmosphere.
→
Answer the following questions:
What are the major factors that are responsible for the loss of biodiversity? What steps are needed to prevent them?
→
Answer the following question in about 30 words:
What were the forces suggested by Wegener for the movement of the continents?
→
Answer the following question in about 150 words.
What type of vegetation would you find in the "C" and "A" type(s) of climate?
→
Answer the following question in about 150 words.
Why does tropical cyclone originate over the seas? In which part of the tropical cyclone do torrential rains and high velocity winds blow and why?
→
Answer the following question in about 30 words.
Name the three types of precipitation.
→
Answer the following question in about 150 words.
Compare the global distribution of temperature in January over the northern and the southern hemisphere of the earth.
→