Question 20

Match List-I with List-II

List-I
(Layer of atmosphere) List-II
(Approximate height over earth's surface)
A F$$_1$$-Layer I 10 km
B D-Layer II 170 - 190 km
C Troposphere III 100 km
D E-Layer V 65 - 75 km

Choose the correct answer from the options given below.

	List-I (Layer of atmosphere)		List-II (Approximate height over earth's surface)
A	F$$_1$$-Layer	I	10 km
B	D-Layer	II	170 - 190 km
C	Troposphere	III	100 km
D	E-Layer	V	65 - 75 km

Troposphere is the lowest layer: 10 km (I) $$\implies$$ C-I

D-Layer is the lowest ionospheric layer: 65 - 75 km (IV) $$\implies$$ B-IV

E-Layer (Kennelly-Heaviside layer) lies above the D-layer: 100 km (III) $$\implies$$ D-III

F1-Layer lies within the upper ionosphere: 170 - 190 km (II) $$\implies$$ A-II

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