Basic General Knowledge
If the plane of the earth's equator were not inclined to the plane of the earth's orbit

there would be no change of seasons
the summers would be warmer
the winters would be longer
the year would be longer

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Basic General Knowledge
To produce sound it is necessary that

the source should execute longitudinal vibrations
the source may execute any type of vibrations
the vibrations of source are not necessary
the source should execute transverse vibrations

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