June 21 marks the winter solstice in the _________ Hemisphere.
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When warm air rises up and cold air from the surrounding areas rushes in to fill its place then this sets up ________________ in air.
___________ is obtained by evaporation of sea.
Polio is a disease caused by which of the following?
An _______________ is a sudden shaking or trembling of the earth.
A deep crack in a glacier is called
In 1981, ISRO launched India's first geostationary satellite called -
The radius of curvature of a concave mirror is 30 cm. Following Cartesian Sign Convention, its focal length is expressed as
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