I Like To Move It
Volca-know It All
Quake It Off
Savaal Kya Hain?!
100
What are endogenetic movements?
Movements inside the surface of the earth (internal movements) are called endogenetic movements.
100
What is a volcanic eruption?
Hot solid, liquid, and gaseous materials are thrown out from the mantle of the earth to the surface of the earth. This is called a volcanic eruption.
100
What is an earthquake?
Earthquake is a movement of the earth's crust due to tremendous tension. When the tension in the crust goes beyond limits, energy is released in the form of waves. This results in an earthquake.
100
Primary waves, secondary waves, surface waves.
What are the types of seismic waves in an earthquake?
200
Movements under the earth's surface happen due to _____________ in the __________ of the earth.
(a) stability, core
(b) stability, crust
(c) instability, mantle
(d) instability, core
(c) instability, mantle
200
When molten magma comes out to the surface of the earth, it is called _________.
Lava
200
Name the different parts of an earthquake.
Focus
Epicentre
Seismic waves (primary, secondary and surface waves)
200
The place where energy waves first reach the surface of the earth during an earthquake.
What is the epicentre?
300
Classify internal movements on the basis of velocity.
(a) Slow movements like formation of mountains and continents
(b) Sudden movements like earthquakes and volcanoes
300
The two types of volcanoes based on types of eruption are:
(a) central type
(b) fissure type
300
What is the relationship between the focus and epicentre of an earthquake?
The focus is the centre of the earthquake from where the energy waves scatter.
The epicentre is the place on the earth's surface where the energy waves reach first.
The epicentre is perpendicular to the focus.
300
The Himalayas.
An example of Fold Mountains
400
Name the three types of mountains that are formed by mountain building movements.
Fold mountains
Block mountains
Rift valleys
400
The three types of volcanoes based on periodicity of eruption are:
(a) Active
(b) Dormant
(c) Extinct
400
The most destructive waves in an earthquake are:
Surface waves
400
Because of internal movements in the earth's surface, tension occurs in the layers of rock. This leads to the formation of fractures in the rocks.
What are faults?
500
Fold mountains are formed due to ___________ and Block mountains are formed due to ____________ forces.
(a) tension, compression
(b) compression, tension
(c) faults, fractures
(d) fractures, faults
(b) compression, tension.
500
Name one active volcano is India.
Barren Island, Andaman and Nicobar Islands
500
An earthquake is measured using ____________ scale.
Seismic waves are measured using ______________.
Richter scale
Seismograph
500
Tsunamis are generated under the oceans.
What is an effect of earthquakes?