INTERIOR OF THE EARTH

Question 1

Direct Sources of earths interior

Answer 1

Mining, drilling, volcanic eruption

Question 2

InDirect Sources of earths interior

Answer 2

Analysis of temeperature and pressure, meteors, gravitation, magnetic field, and seismic activity

Question 3

lithosphere refers to the portion of depth

Answer 3

up to 200 km from the

surface of the earth

Question 4

Two types of body waves

Answer 4

p and s waves

Question 5

waves are similar to sound waves. They travel

through gaseous, liquid and solid materials

Answer 5

The P-waves

Question 6

Shadow zone of P waves

Answer 6

105 to 145

Question 7

Shadow zone of s waves

Answer 7

beyonf 105

Question 8

collapse earthquakes

Answer 8

In the areas of intense mining activity,
sometimes the roofs of underground
mines collapse causing minor tremors

Question 9

explosion earthquakes.

Answer 9

Ground shaking may also occur due to the explosion of chemical or nuclear devices

Question 10

Types of Earthquakes

Answer 10

tectonic earthquakes, volcanic earthquake. collapse earthquakes explosion earthquakes. reservoir induced earthquakes

Question 11

The magnitude scale is known as the

Answer 11

Richter scale 0 to 10

Question 12

The intensity scale is named after

Answer 12

Mercalli, 1 to 12

Question 13

The mean thickness of

oceanic crust is

Answer 13

5 km

Question 14

The mean thickness of the

continental is around

Answer 14

30 km

Question 15

mean density of oceanic crust is

Answer 15

2.7g/cc

Question 16

mean density of continental crust

Answer 16

3 g/cc

Question 17

type of rock in oceanic crust is

Answer 17

basalt

Question 18

The mantle extends from

Answer 18

Moho’s discontinuity to a depth of 2,900 km.

Question 19

The upper portion of the mantle is called

Answer 19

asthenosphere. extending upto 400 km.

Question 20

Main source of magma

Answer 20

asthenosphere.

Question 21

density in asthenosphere.

Answer 21

3.4g/cc higher than crust

Question 22

The crust and the uppermost part of the mantle are called

Answer 22

lithosphere. Its thickness ranges from 10-200 km

Question 23

The core mantle boundary is located at the depth of

Answer 23

2,900 km.

Question 24

Nife layer

Answer 24

core

Question 25

density at core mantle boundary

Answer 25

5 g/cc

Question 26

density at core centre

Answer 26

13g/cc

Question 27

magma.

Answer 27

The material in the upper mantle portion

Question 28

are the largest of all the volcanoes on the earth.

Answer 28

Shield volcanoes

Question 29

Shield volcanoes

Answer 29

basalt, very fluid, generally low explosivity

Question 30

cinder cone found in

Answer 30

Shield volcanoes

Question 31

characterised by eruptions of cooler and more viscous lavas than basalt and explosive eruptions

Answer 31

Composite Volcanoes

Question 32

These are the most explosive of the earth’s | volcanoes.

Answer 32

Calderas

Question 33

tend to collapse on themselves rather than building any tall structure. The collapsed depressions are called

Answer 33

calderas.

Question 34

Intrusive Volcanic Forms

Answer 34

Batholiths, Lacoliths, Lapolith, Phacolith and Sills, dykes

Question 35

These are large dome-shaped intrusive bodies | with a level base and connected by a pipe-like conduit from below

Answer 35

Lacoliths Karnataka plateau

Question 36

develops into a saucer shape, concave | to the sky body, it is called

Answer 36

lapolith

Question 37

A wavy mass of intrusive rocks, at times, is found at the base of synclines or at the top of anticline in folded igneous country.

Answer 37

phacoliths

Question 38

The near horizontal bodies of theintrusive igneous | rocks are called

Answer 38

sill or sheet (thinner)