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741.

Ionosphere is very important in worldwide communication. When an atom becomes an ion?

A.	When it gains electrons	B.	When it loses electrons
C.	When it splits up in electrons	D.	When it gain or loses electrons

742.

Latitude is part of a geographical measurement. What is its function in combination with longitude?

A.	It helps in aviation	B.	It helps in oceans
C.	Make possible to locate anything on earth's surface	D.	Make possible to locate stars in the sky

743.

Through the crater or vents of volcano, molten rock is thrown out on to the Earth's surface. What is called this molten rock?

A.	Magma	B.	Lava
C.	Trash	D.	Molten mud

744.

What is called a flash or flashes of light that is seen during a thunderstorm?

A.	Rainbow	B.	Thunder light
C.	Liightning	D.	Thundering

745.

Which molten material is formed in the upper mantle or crust of the earth, which is composed of a mixture of various complex silicates in which various gaseous materials are dissolved including water?

A.	Liquid Lava	B.	Lava
C.	Fresh Lava	D.	Magma

746.

What is formed when Magma is cooled?

A.	Igneous rocks	B.	Calcium
C.	Mountains	D.	metamorphic rocks

747.

Anound the centre of the Earth there is a layer called the core and around the surface of the earth there is a layer called crust. What is called the layer between core and crust?

A.	Magma	B.	Inner core
C.	Mantle	D.	Outer core

748.

Metamorphic means to do with change. What is metamorphic rock?

A.	One of the three types of rocks making up earth's ionosphere	B.	One of the three types of rocks making up earth's inner
C.	One of the three types of rocks making up earth's mental	D.	One of the three types of rocks making up earth's crust

749.

Mention the example(s) of metamorphic rock?

A.	Marble	B.	Slate
C.	Both of them	D.	None of them

750.

Name the type of tropical wind that blows strongest in Pakistan, India and Southeast Asia. During winter it blows from the land to the sea, and in summer it blows from sea onto land?

A.	Tropical winds	B.	Tropical storms
C.	Monsoon	D.	Hurricane