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UPSC > Physical Geography > Flashcards

Physical Geography Flashcards

1
Q

Earth’s radius

A

Approx 6371km

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2
Q

Three divisions of earth interior

A

Crust, Mantle and Core

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3
Q

Crust thickness

A

Till 34 km

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4
Q

Mantle depth

A

From 34 to 2900 km

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5
Q

Core depth

A

From 2900km to 6371 km or 6400 km

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6
Q

Composition of Crust

A

SIAL - silicon and Aluminium

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7
Q

Composition of Mantle

A

SIMA

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8
Q

Composition of core

A

NIFE

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9
Q

Which crust is more thick oceanic or continental

A

Continental

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10
Q

Oceanic crust is made up of ?

A

SIMA

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11
Q

What is the reason behind high temp inside earth as per Arthur Holmes

A

Radioactive Elements

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12
Q

For every ____ m 1° C temp increases inside the earth

A

32

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13
Q

After 100km Rock melts true or false

A

True

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14
Q

What consists of Lithosphere

A

Crust + upper part of upper mantle

Up till 100-200 km

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15
Q

Lithosphere consists of SIMA AND SIAL ? T OR F

A

True

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16
Q

Asthenosphere is in which state

A

Semi solid

17
Q

Asthenosphere is the source of ?

A

Magma

18
Q

Asthenosphere depth range

A

100km to 700 km

19
Q

Asthenosphere is part of crust/mantle / core

A

Upper mantle

20
Q

What is the state of lower Mantle

A

Solid State due to pressure

21
Q

State of outer core

A

Liquid

22
Q

State of inner core

A

Solid

23
Q

Why outer core is liquid

A

Because iron has a low melting point as compared to silicates

24
Q

Barysphere

A

Outer and inner core

25
Q

Mesosphere

A

Lower Mantle

26
Q

Discontinuity b/w Upper crust and Lower Crust

A

Conrad

27
Q

Discontinuity between Crust and Mantle

A

Moho

28
Q

Discontinuity between upper Mantle lower Mantle

A

Repetite

29
Q

Discontinuity between Mantle and core

A

Guttenberg

30
Q

Discontinuity between Outer and inner core

A

Lehman

UPSC (4 decks)

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