calving
グリーンランド最大のペテアマン氷河の一部が分離し、ニューヨークのマンハッタンの2倍の大きさの氷山が生まれました。温暖化の影響だと考えられています。
この現象はcalving（「氷山分離」「カービング」と呼ばれるそうです。原形はcalve「子牛（calf）を産む」「自然分娩」です。勉強になりました。（UG）
Iceberg breaks off from Greenland's Petermann Glacier
An iceberg twice the size of Manhattan has broken away from the Petermann Glacier in northern Greenland.
Images from a Nasa satellite show the island breaking off a tongue of ice that extends at the end of the glacier.
In 2010 an ice island measuring 250 square km (100 square miles) broke off the same glacier.
The process that spawns icebergs - known as calving - is a natural, periodic process affecting all glaciers that terminate at the ocean.
A previous calving event at the same glacier in 2010 created an iceberg twice the size of this one.
