World Geography
The magnetic field of earth, Magnetosphere expands to about

None of these
64,000 km above the earth's surface
9600 km above the earth's surface
8000 km above the earth's surface

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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:

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

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