Meeraha aynu ku nool nahay ee loo yaqaanno Dhul (Earth), waxa uu ka mid yahay sagaal meero, suurta galne ma aha in siddeedda kale lagu noolaado, ayada oo ay sabab u tahay in aysan laheyn maaddada dareeraha ah ee loo yaqaanno Biyo, ee kiimiko ahaan loo qoro (H2O).
