Pyramids were built in Ancient Egypt as tombs, or burial places, for Egyptian pharaohs, or kings. They believed that the pyramids made you immortal. The Ancient Egyptians believed in an afterlife, so it was very important to them to protect the bodies of their pharaohs.
CaCO3, or calcium carbonate, has a molar mass of 100.09 grams per mole. This means there are roughly 566 grams of CaCO3.
At 2.5%, magnesium is the eighth most abundant element in the earth's crust. It is the third most abundant element in sea water which averages about 0.13% magnesium by weight. Magnesite (MgCO3) is an ore for magnesium production and the source of a range of industrial minerals. When pure, magnesite contains 47.8% magnesium oxide and 52.2% carbon dioxide. Natural magnesite almost always contains some calcium carbonate as the mineral calcite and iron carbonate as the mineral siderite. Magnesium also occurs in dolomite, which has the formula CaMg(CO3)2 and in which MgCO3 constitutes 45.65% (equivalent to 21.7% MgO) and CaCO3 54.35%.