PPT: Interior of Earth- Geography Lecture 2(1) UPSC Notes | EduRev

Crash Course for UPSC aspirants

UPSC : PPT: Interior of Earth- Geography Lecture 2(1) UPSC Notes | EduRev

 Page 1


GEOGRAPHY 
CRASH COURSE
CAPSTONE IAS LEARNING
Page 2


GEOGRAPHY 
CRASH COURSE
CAPSTONE IAS LEARNING
INTERIOR OF EARTH
Page 3


GEOGRAPHY 
CRASH COURSE
CAPSTONE IAS LEARNING
INTERIOR OF EARTH
Importance of understanding the 
Interior of The Earth
Understanding the structure of the earth’s interior (crust, mantle, 
core) and various forces (heat, seismic waves) emanating from it is 
essential to understand
• the evolution of the earth’s surface, its current shape and its 
future.
• the geophysical phenomenon like volcanism, earthquakes, etc.
• earth’s magnetic field
• the internal structure of various solar system objects
• the evolution and present composition of the atmosphere
• for mineral exploration
Page 4


GEOGRAPHY 
CRASH COURSE
CAPSTONE IAS LEARNING
INTERIOR OF EARTH
Importance of understanding the 
Interior of The Earth
Understanding the structure of the earth’s interior (crust, mantle, 
core) and various forces (heat, seismic waves) emanating from it is 
essential to understand
• the evolution of the earth’s surface, its current shape and its 
future.
• the geophysical phenomenon like volcanism, earthquakes, etc.
• earth’s magnetic field
• the internal structure of various solar system objects
• the evolution and present composition of the atmosphere
• for mineral exploration
Sources of 
Information
Direct Sources
Indirect Sources
Page 5


GEOGRAPHY 
CRASH COURSE
CAPSTONE IAS LEARNING
INTERIOR OF EARTH
Importance of understanding the 
Interior of The Earth
Understanding the structure of the earth’s interior (crust, mantle, 
core) and various forces (heat, seismic waves) emanating from it is 
essential to understand
• the evolution of the earth’s surface, its current shape and its 
future.
• the geophysical phenomenon like volcanism, earthquakes, etc.
• earth’s magnetic field
• the internal structure of various solar system objects
• the evolution and present composition of the atmosphere
• for mineral exploration
Sources of 
Information
Direct Sources
Indirect Sources
Direct Sources 
• Deep earth mining and drilling reveal the nature of rocks deep down the surface.
• But as mining and drilling are not practically possible beyond a certain depth, 
they don’t reveal much information about the earth’s interior.
• Mponeng gold mine (deepest mine in the world) and TauTona gold 
mine (second deepest mine in the world) in South Africa are deepest mines 
reaching to a depth of only 3.9 km.
• And the deepest drilling is only about 12 km deep hole bored by the Soviet Union 
in the 1970s over the Kola Peninsula.
• Volcanic eruption forms another source of obtaining direct information.
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