World Geography
The steady or initial phase of the magnetic storms is

preceded by storm sudden commencement
a sharp increase of the field
magnetic storm at middle and low altitudes
None of these

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World Geography
Which among the following statements is/are correct about the symbiotic life of Corals?Algae gives carbon dioxide and other substances the  coral polyp needs.Coral polyp gives off oxygen and other nutrients that the algae needs.Select the correct code from the options given below:

Both 1 & 2
Neither 1 & 2
Only 1
Only 2

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