This is the cycle which tyrns lime stone to - quiclime form this to -Slaked lime from this to - lime water an this turns into limestone and a cycle is created.
Heat and pressure
Grant particles settle on the ocean floor
This is probably the iyi-uwa, a stone owned by ogbanje. With posession of this stone, the medicine man is able to prevent Ezinma from dying and being reborn in Ekwefi again only to repeat the cycle of death and rebirth.
The sand would need to be compacted and cemented together by precipitated minerals over time.
No, because the water you might drink today was drunk by someone in the stone age or when ever, it's gross, but part of the water cycle.
Fire Stone - Flareon Water Stone - Vaporeon Thunder Stone - Jolteon Through "happiness" in the daytime - Espeon Through "happiness" in the nighttime - Umbreon contrary to popular belief you can't evolve eevee with a sun stone or a moon stone. in Diamond and Pearl: Levelling your Eevee up on Route 217 (http://bulbapedia.bulbagarden.net/wiki/Route_217) - Glaceon Levelling your Eevee up in Eterna Forest (http://bulbapedia.bulbagarden.net/wiki/Eterna_Forest) - Leafeon
A period cycle is not set and stone and can change without warning, to be sure of your health you should check with your doctor. You may have a medical history you do not mention which could affect your period and body.
I personally have not heard of a kidney stone effecting your menstrual cycle, but I am not a Doctor. I would perform a pregnancy test is there is a risk you could be pregnant. Also see your Doctor about your missed periods.
nitrogen cycle, carbon cycle, water cycle, and sulfur cycle
Some ancient civilizations such as the Mayans believed in human sacrifice in order for the natural cycle of seasons to continue. The Mayans would sacrifice prisoners from the top of their stone temples.
Recalling the class in Dr. Tuma's cave, that's Class B.(I never discarded any of my stone tablets.)