9. Earth:[1]

If the Bris falls on Shabbos, then the earth must be prepared before Shabbos.[2] [If it was not prepared before Shabbos, then it may not be moved, and in such a case one is simply not to use any earth.[3]]

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[1] Michaber Y.D. 260:10; Tur 260:10; Levush 260; Shevach Habris 18 footnote 18; See Pesakim Uteshuvos 265:26

Other opinions: Some Poskim rule that even if the earth was prepared from before Shabbos it may not be used on Shabbos due to a decree that one may bring earth on Shabbos itself. Practically, however, the custom is to permit using earth that was prepared from before Shabbos. [See Shach 260:20; Bach 260]

[2] The reason: As otherwise the earth is considered Muktzah and is forbidden to be moved on Shabbos  even for the sake of a mitzvah. [Levush ibid]

[3] Levush ibid; Aruch Hashulchan 260:32