1.

Match Column-I (layers in the ionosphere for skywave propagation) with Column-II (their height range) : The correct answer is :

Answer»

`{:(I , II , III , IV) , (a , B , C , d):}`
`{:(I , II , III , IV), (d , c , a , b):}`
`{:(I , II , III , IV), (d , c , b , a):}`
`{:(I , II , III , IV) , (c ,d , a , b):}`

Answer :C


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