A surplus allows snow to accumulate and for the pressure of snow accumulated over the years to transform buried snow into glacial ice with a depth great enough for the ice to flow.

剩余的积雪能够让雪集成堆，且由于多年的积雪形成的压力，剩余的积雪能够让掩埋的雪变成冰川冰，这些冰川冰的厚度足以使冰块流动。

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The North Greenland Eemian Ice Drilling (NEEM) project reached bedrock in July 2010, at a depth of more than 2,500 metres.

北格林兰岛的冰川研究计划（NEEM）是于2010年7月开凿的，大概会对2500深的基岩进行研究。

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The North Greenland Eemian Ice Drilling (NEEM) project reached bedrock in July 2010, at a depth of more than 2, 500 metres.

北格林兰岛的冰川研究计划（NEEM）是于2010年7月开凿的，大概会对2500深的基岩进行研究。

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So by firing radio pulses through the overlying sheet and recording the return echoes, scientists can plot both the depth of the rock bed and - by definition - the thickness of the ice covering.

BBC: Antarctic ice volume measured

The ice fields in the Himalayan mountains have receded dramatically from their breadth and depth in the 1980s, according to the Australian environmentalist.

FORBES: 500 Million People Will Be Displaced By Glaciers Melting In Greenland And The Himalayas