The United States and Nigeria are examples of presidential democracies. The executive branch includes the president and his cabinet. Along with the judicial and legislative branch, the three branches of government work to keep checks and balances, but the president has final say.
It is a gemstone that is found on the African continents and is made pos the silica materials and has compounds of the aluminum and iron and the potassium lithium and the sodium and this is classified as a semi-precious stone. The metamorphic rocks and the sandstone consists of these minerals and the colors of the gemstone cane alter by the heat treatment.
