Question: what is moai made of?
Answer: All but 53 of the more than 900 moʻai known to date were carved from tuff (a compressed volcanic ash) from Rano Raraku, where 394 moʻai in varying states of completion are still visible today. There are also 13 moʻai carved from basalt, 22 from trachyte and 17 from fragile red scoria.