When warm air rises up and cold air from the surrounding areas rushes in to fill its place then this sets up ________________ in air.
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Workers in leather tanning industries tend to suffer from
Recently, scientists have found second Great Spot 24000 km across and 12000 km wide on which planet?
Which of the following is the cleanest source of energy?
__________ acts as a shield absorbing ultraviolet radiation from the sun.
In terms of size, Saturn ranks no. ___ in our Solar System.
Plants get their energy to produce food from which of the following?
Who discovered Pluto?