"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
God does say He will graciously entertain our prayers. He says that if we exercise faith, and if our request is in accordance with His will, He will hear us.