Vishnupurana 6.4.31

6.4.31

yenedam āvṛtaṃ sarvam aṇḍam apsu pralīyate
saptadvīpasamudrāntaṃ saptalokaṃ saparvatam //

The rudiment of form being destroyed, and fire deprived of its rudiment, air extinguishes fire, and spreads resistlessly over space, which is deprived of light when fire merges into air. Air then, accompanied by sound, which is the source of ether, extends every where throughout the ten regions of space, until ether seizes upon contact, its rudimental property; by the loss of which, air is destroyed, and ether remains unmodified: devoid of form, flavour, touch, and smell, it exists unembodied and vast, and pervades the whole of space. Ether, whose characteristic property and rudiment is sound, exists alone, occupying all the vacuity of space. But then the radical element egotism devours sound, and all the elements and faculties are at once merged into their original. This primary element is consciousness, combined with the property of darkness, and is itself swallowed up by Mahat, whose characteristic property is intelligence; and earth and Mahat are the inner and outer boundaries of the universe. In this manner, as in the creation were the seven forms of nature (Prakriti), reckoned from Mahat to earth, so, at the time of elemental dissolution, these seven successively reenter into each other. The egg of Brahmá is dissolved in the waters that surround it, with its seven zones, seven oceans, seven regions, and their mountains.