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In page Easter Island:

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Almost all (95%)[citation needed] moai were carved from compressed, easily worked solidified volcanic ash or tuff, found at a single site on the side of the extinct volcano Rano Raraku. The native islanders who carved them used only stone hand chisels, mainly basalt toki, which lie in place all over the quarry. The stone chisels were sharpened by chipping off a new edge when dulled. While sculpting was going on, the volcanic stone was splashed with water to soften it. While many teams worked on different statues at the same time, a single moai took a team of five or six men approximately a year to complete. Each statue represented the deceased head of a lineage.[citation needed]