A considerable degree may be on resulting shape of some figures involved mechanical vibrations and resonance of underground cavities, either empty (caverns), or filled with water (natural water reservoirs), or filled with a substrate that is filled with water (aquifer).
shahada makubwa anaweza kusababisha sura ya baadhi ya takwimu Involved vibrations mitambo na resonance ya mashimo ya chini ya ardhi, Ama tupu (Caverns), au kujazwa na maji (maji ya asili hifadhi), au kujazwa na substrate Hiyo ni kujazwa na maji (aquifer).