Is éard is an Peidisféar ann (Sean-Ghréigis πέδον [pedon] ithir, cré + σφαίρα [sfaíra] sféar) ná an tsraith Domhanda is forimeallaí atá comhdhéanta d'ithreach agus faoi réir phróiseas fhoirmiú ithreacha. Bíonn sé ann ag comhéadan an litisféir, an atmaisféir, an hidrisféir agus an bithsféir[1].
Tagairtí
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