[Answer] Austria’s Eisriesenwelt cave has a 1,000-year-old layer of what?

Step 1 : Introduction to the question "Austria’s Eisriesenwelt cave has a 1,000-year-old layer of what?"

...Eisriesenwelt in Austria is the world’s largest ice cave, with layers of ice dating back about a thousand years. The cave is carved out by water entering and freezing every year, which means that it’s consistently growing. Only the first half-mile from the entrance is covered in ice, but cold air continues to flow through the rest of the corridors and chimneys.

Step 2 : Answer to the question "Austria’s Eisriesenwelt cave has a 1,000-year-old layer of what?"

Ice:

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