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61.

Who first held the view that the earth is a sphere?

A.	Pythagoras	B.	Newton
C.	Galileo	D.	Aristotle

62.

The busiest ocean route in the world is

63.

Spring tides occur when

A.	When the gravitational pull of the sun is at right angles to that of the moon	B.	The moon casts its shadow on the sun
C.	Sun, moon and earth are in a straight line	D.	None of the above

64.

Hurricanes are

A.	Tropical cyclones of the West Indies	B.	Tropical cyclones of China
C.	Depressions in the North Sea	D.	Tropical depressions in the Mediterranean Sea

65.

The lowest layer of the earth's atmosphere is called

A.	Stratosphere	B.	Ionosphere
C.	Mesosphere	D.	Troposphere

66.

Which among the following is a metamorphic rock?

A.	Coal	B.	Limestone
C.	Slate	D.	Shale

67.

Neptune's day is approximately

A.	12 hours	B.	18 hours
C.	23 hours	D.	24 hours

68.

Dry summers great sunshine and rainy winters are characteristics of which of the following types of climates?

A.	Mediterranean	B.	Tropical
C.	Tundra	D.	Equatorial

69.

Reasons change due to

A.	Revolution of the earth around the sun	B.	Change of distances during regolution round the sun
C.	Inclination of the earth's axis by 66 1/2?	D.	All of the above

70.

The earliest rocks formed on the earth's surface are

A.	Plutonic	B.	Sedimentary
C.	Igneous	D.	Metamorphic