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Chapter 3, Section 1-6
Despite being countless in number, their dimensions are not equivalent; that is, the thickness of the countless layers of earth beneath the first ground, including the layers of metal and the layer of body, is greater than that of the solid layers and the thin layers beneath the second ground. In the same manner, the layers beneath the sixth ground progressively have greater thickness compared to the layers of the seventh ground. Thus, understanding the sky is similar.
The first ground is termed Ratnaprabhā due to its jewel-like qualities. Similarly, the second ground is referred to as Khejaraprabhā due to the abundance of gravel; the third as Bālūkaprabhā due to the predominance of sand; the fourth as Padmaprabhā due to the prevalence of clay; the fifth as Dhūmaprabhā due to the excess of smoke; the sixth as Tamoprabhā due to the predominance of darkness; and the seventh ground is called Mahātamoprabhā due to the abundance of wealth, following the sequential names Dharmā, Vaśā, Śailā, Anjanā, Rāh, Mādhavyā, and Mādhavī.
The Ratnaprabhā ground consists of three parts. The first section, the Kharakāṇḍa, is rich in jewels; it is the uppermost layer with a thickness of 16,000 yojanas. Below it is the Khejo Kāṇḍa, filled with abundant clay, having a thickness of 84,000 yojanas. Below that, the third part is the Jalbahul, filled with water, which is 80,000 yojanas thick. The total thickness of these three parts sums to one lakh eighty thousand yojanas, which constitutes the thickness of the first ground. There is no division from the first to the seventh ground, as it consists of gravel and sand.