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71.

High salinity in the sea result from:

A.	High temperature	B.	Low temperature
C.	Enclosed Seas

72.

The portion of floor skirting the land is called:

A.	Continental shelf	B.	Continental slope
C.	Harbor

73.

Spring tides occur:

A.	Twice a day	B.	Twice a month
C.	Twice a year

74.

Kuroshio is a current having its origin in:

A.	Florida coast	B.	Caribbean sea
C.	Gulf of Mexico	D.	None of above

75.

At about the new moon the tides are:

A.	Greater than usual	B.	Smaller than usual
C.	Equal to mean amplitude

76.

A well marked and wide continental: shelf is characteristics of

A.	Indian ocean	B.	Northern Pacific ocean
C.	North Altantic ocean

77.

The Atmospheric element which combines readily with many elements and compounds in rocks is:

A.	Nitrogen	B.	Oxygen
C.	Hydrogen

78.

Polar front theory deals with:

A.	Formation of mountains	B.	Cloud formation
C.	Atmospheric disturbance

79.

Cold winds blowing down slope by gravity are:

A.	Fohn winds	B.	Jet streams
C.	Katabatic

80.

The mean thickness of troposphere over equator and poles is:

A.	17 kilometers and 8 kilometers	B.	27 kms and 18 kms
C.	27 kms and 20 kms