Physics
Which of the following options correctly explains the term heat budget?

It is the radiation from the earth in the form of long waves.
It is the balance between incoming and outgoing radiation
It is the amount of heat which the surface of earth receives from the sun.
It is a mode of transfer of heat through matter by molecular activity.

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Physics
The term ''equinox' means

The axis of the Earth around which it rotates
When the day and night are of equal duration
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The path which the Earthtakes around the Sun

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