Easter Island was created through volcanic action and the entire island is covered with baseball to watermelon sized lava rocks that shot out of numerous volcanoes that dot the island. Farmable land is sparse and has been created through the removal of millions of these rocks to find a rich soil beneath. The lava that flowed from these volcanoes often travelled to the sea via tubes. When the lava cooled, many of these hollow tubes remained. The islanders used these tubes for food storage as well as shelter. Tube entrances are often quite a distance from the sea, yet you can climb through these tubes and pop out in the side of a cliff looking directly at the rough seas below.
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