出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/05/02 05:18 UTC 版)
Step pyramids are structures which characterized several cultures throughout history, in several locations throughout the world. These pyramids typically are large and made of several layers of stone. The term refers to pyramids of similar design that emerged separately from one another, as there are no firmly established connections between the different civilizations that built them.