Question Q.15Discuss the concept of isostasy and explain its role in shaping Earth's major landforms.GS1GS1

DISCUSS the concept of isostasy and explain its role in shaping Earth's major landforms. (15 marks, 250 words)

Introduction

The phenomenon of isostasy is defined as the maintainance of equilibrium in the earth's lithosphere in relation to the various underlying geological forces experienced in all crustal, mantle layers of the earth.

32 words

Main Body

Definition and basic concept:

Isostasy refers to the maintenance of equilibrium in the Earth's lithosphere, controlled by the interaction of various underlying geological forces across crustal and mantle layers.

Factors Impacting Isostasy:

1The maintenance of equilibrium is affected by the maintaining force experienced in [the lithosphere]

Factors impacting isostasy (continued):

2Tectonic movements along constructive and destructive boundaries impact isostasy

3Volcanism witnessed as a result of rising magma alters the lithospheric topography

ROLE IN SHAPING EARTH'S LANDFORMS

(I) Mountains Formation:

1Fold mountains formed at convergent boundaries are a result of isostasy

2The subducting plate compensates for the rising plate [isostatic principle]

[Diagram showing convergent boundary interaction between plates]

(II) Rift Valleys and Block Mountains:

1Rift diastrophism witnessed in the block mountains

2For the rising block mountain [isostatic adjustment occurs]

Valley formation (continued):

Rift Valleys:

1Rift valleys are result of vertical forces on the blocks along fault lines

2Rifts have consequent deep valley formation in ocean topography too

3Sea floor spreading contributes to mid-oceanic ridge and trenches - maintains isostasy

4Divergent boundaries → Trenches undersea

Volcanic Landforms:

1The mantle plumes lead to formation of volcanic arcs and islands

[Diagram showing Black Mountains with Horst and Graben formation]

Repetition of previous section (pages 34-35 appear identical):

Valley formation:

1The rift valleys are result of vertical forces on the blocks along fault lines

2The rifts have consequent deep valley in ocean topography too

3Sea floor spreading contributes to mid-oceanic ridge and trenches maintaining isostasy

4Divergent boundaries → Trenches undersea

Volcanic Landforms:

1The mantle plumes lead to formation of volcanic arcs and islands

— ANKITA PATIL · AIR 140

275 words17 paragraphs

Conclusion

The phenomenon of isostasy is crucial to study the topography, landforms of the earth showing a socio-economic impact on resident population as well.

23 words

Diagram

Cross-section diagram of Earth's layers labeled: Lithosphere, Mountain, Crust, Asthenosphere, Mantle, Outer liquid core, Inner solid core - showing internal structure relevant to isostatic processes

Good definition provided
Relevant diagram included
Establishes multi-layer perspective

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ANKITA PATIL

AIR 1402025

Subject & Paper

GS1GS1

Topic

Salient features of World's Physical Geography

Important Geophysical Phenomena

Isostasy and landform development

Writing Stats

330

Total words

Paragraphs

Linked PYQ

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50M2020कुरुत