The iceberg that was for a time the biggest in the world is no more. A68, as it was known, covered an area of nearly 6,000 km²    1    it broke away from Antarctica in 2017. That's like a small country. But satellites show the mega-berg has now virtually gone, broken into countless small fragments    2    the US National Ice Center says are no longer worth tracking. Most glaciologists regard A68 as the product of a very    3    （nature）process, and it has nothing to do with human-induced climate change.

Hawaii is the only state not on the continent of North America. The State of Hawaii consists     1     8 bigger islands and 2000 more small islands. Of the bigger islands, Hawaii Island is not only the largest but also the youngest. People can find a few active volcanoes in the island. Mauna Loa and Kilauea are the most active volcanoes,     2     the American government has opened Volcanoes National Park. The island’s largest city Hino, also the second largest one in Hawaii State,     3     (stand) on the northeast coast of the island.