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GCSE Geography · key term
A cylinder of ice drilled from a glacier or ice sheet, containing layers and trapped air that preserve evidence of past conditions.
Used by AQA, Edexcel and OCR
Specification 3.1.1.4 · Paper 1
A cylinder of ice drilled from an ice sheet, containing a sequence of ice layers and trapped ancient air.
Revise: Evidence for Climate ChangeScientists drill ice cores from ice sheets in places such as Greenland and Antarctica. Snow accumulates and becomes compressed into ice, preserving a sequence of layers. Some ice-core records extend back about 800,000 years: a substantial part of the Quaternary, but not its whole length.
Specification 2.2 · Paper 1
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A long cylinder of ice drilled from a glacier or ice sheet, containing evidence of past atmospheric conditions and temperatures.
Ice cores are drilled from ice sheets such as those in Greenland and Antarctica. Snow accumulates and becomes compressed into ice, preserving successive layers. Bubbles trapped in the ice contain samples of the ancient atmosphere, allowing scientists to measure past carbon dioxide concentrations.
Paper 1
Revise: Evidence and Reconstructing the Climate RecordIce cores are cylinders drilled from glaciers and ice sheets, including those in Greenland and Antarctica. Snow accumulates and becomes compressed into ice, preserving successive layers. These layers allow scientists to build a sequence of past conditions, extending back hundreds of thousands of years.
Specification 2.1a · Paper 1, Paper 3
A cylinder of ice drilled from an ice sheet, containing layers and trapped gases that preserve evidence of past conditions.
Revise: Evidence for Climate ChangeIce cores provide two related kinds of evidence. Tiny air bubbles preserve samples of the past atmosphere, allowing scientists to measure gases such as carbon dioxide. The water molecules in the ice contain different forms of oxygen, called isotopes.