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721.

How much is earth old according to recent estimation?

A.	2.55 billion years	B.	4.55 billion years
C.	3.55 billion years	D.	5.55 billion years

722.

what is called the shaking of earth due to sudden release of stresses built up in the earth's surface?

A.	Drought	B.	Cyclone
C.	Earth shake	D.	Earthquake

723.

Seismology is:

A.	Study of moon	B.	Study of Earthquakes
C.	Study of Nature	D.	Study of Earth

724.

The point at which an earthquake originates is called seismic focus. What is called the point on the earth surface directly above the seismic focus?

A.	epicentre	B.	seismic point
C.	seismic plate	D.	seismicentre

725.

Equator or terrestrial equator is the great circle whose plane is perpendicular to the earth's axis. What is its length that is divided into 360 degrees of longitude?

A.	20, 092 km	B.	40, 092 km
C.	30, 092 km	D.	50, 092 km

726.

Forces such as wind or water wear down the land. How is known this process?

A.	Erosion	B.	Desertification
C.	Mudsliding	D.	Demudding

727.

How is known a fracture of break in the Earth's crust which has allowed the rocks on either side of it to move in different directions during periods of geological stress and upheaval?

A.	Crack	B.	Fault
C.	Break	D.	Fracture

728.

Generally, ear the Earth's surface the cloud is formed when the air has cooled so much that it cannot hold all its water vapour, and excess is precipitated in the form of water droplets. What is it called?

A.	Fog	B.	Rainbow
C.	Condensation	D.	Snow

729.

Which time is mesured by the Geological time scale?

A.	Time from earth's formation to 19th century	B.	Time from present to future
C.	Time from the earth's formation to the end	D.	Time from the earth's formation to present

730.

Who study the rocks and minerals near the earth's surface?

A.	Geologists	B.	Surveyor
C.	Naturalists	D.	Earth Researches