We all know that a tsunami is a powerful thing, but did you know that there are boulders in Tonga that could have been thrown inland by an "ancient wave"?
The accompanying photo is the largest of the group of 7 huge coral boulders that were moved uphill by a volcano-triggered tsunami within the last 7,000 years.
"The largest of the seven boulders is 50 feet (15 meters) wide and estimated to weigh 1,600 tons. It currently sits more than 300 feet (100 meters) from the sea and 30 feet (10 meters) above sea level, an anomaly on the South Pacific island's flat landscape. "
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