How do people make mummies?

Mummifaction occurs by two categories; accidentally (environmental), or purposefully (natrification). Accidentally has two fundamental environmental conditions; xerological (drying) i.e. arctic, elevated or acidic (peat bogs) Drying/xero environments have produced mummifaction in the arctic, Alps, high, dry deserts; Gobi, Atacama, et. al. Acidic peat bogs in the Americas, Europe, China Purposely, by natrification (adding salt) in Egypt, and briefly, Asia