Guess words' meaning (Climate change reveals ancient artefac
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Well above the treeline in Norway’s highest mountains, ancient fields of ice are "shrinking" as Earth’s climate warms.
becoming smaller, reducing
Extreme cold is one reliable way to keep artefacts relatively fresh for a few thousand years, but once thawed out, these materials experience "degradation" relatively swiftly.
decline in quality
Unless they’re protected from the microorganisms that cause "decay", they tend not to last long.
damage
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