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Di laman Litupan ais:

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Terdapat kira-kira 30 juta km³ keseluruhan jisim ais di Bumi. Suhu jisim-yang disukat rata-ratanya antara -20 °C dan -30 °C. Teras litupan ais menunjukkan suhu yang malar antara -15 °C dan -20 °C.[perlu rujukan]