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has begun in Tonga after the island was hit by a tsunami and covered in
ash at the weekend. The undersea volcano erupted on Saturday. Experts believe it was the world's biggest
in 30 years. It sent tsunami
across to Japan and the U.S. It also destroyed
parts of Tonga. Islanders are
trying to restore their normal
. However, the ash is making this difficult. A lot of the
work cannot go ahead until the ash has been cleared. It has buried
and is also blocking
of the country's roads.