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Snow on lower mountain slopes can be a major challenge for any of the animals that live there.
低海拔山坡上的雪，是任何生活在那里的動物的一大挑戰(zhàn)。
On the high peaks, however, really heavy snowfalls can be lethal.
然而在較高的頂峰，大量降雪卻可能致命。
The rockies in North America. They rise to heights of over 4,400 metres.
位于北美的落基山脈。山峰可以超過4400米高。
In the winter, the winds blowing across the high summits can create snowy overhangs -- cornices,
冬天時，吹過高聳山頂?shù)娘L(fēng)會產(chǎn)生凸出懸崖的積雪，懸雪，
up to ten metres thick and weighing many tonnes.
厚達十米而且可達到數(shù)噸重。
In the spring, as the temperatures rise, the cornices may become unstable.
到了春天，當(dāng)溫度上升，懸雪可能變得不穩(wěn)定。
And that can be catastrophic. Avalanche.
而那可能造成災(zāi)難。雪崩。
As it tumbles downwards, it accelerates to speeds of 100mph or more.
當(dāng)雪翻滾下山坡，雪會加速到達時速100英里或更高。
Only a racer drone camera can follow its course.
只有競速無人機能追上雪崩的軌跡。
In just two minutes, up to a million tonnes of snow hurtle down the mountainside.
在僅僅兩分鐘內(nèi)，多達一百萬噸的雪從山坡落下。
Avalanches can be hugely destructive, and climate change is making them more and more unpredictable.
雪崩非常具有毀滅性，而氣候變化讓它們越來越不可預(yù)測。
