地球上的冰冻水

了解冰冻圈及其在地球水系统中的作用——冰冻圈是地球上所有冻结的水（包括冰盖、冰川、海冰、永久冻土和积雪）。极地冰盖储存了地球上约69%的淡水。如果所有极地冰融化，海平面将上升超过65米。水循环通过蒸发、降水和融水流入海洋，将极地冰与全球系统联系起来。

Understand the cryosphere and its role in Earth's water system — the cryosphere is all frozen water on Earth (ice sheets, glaciers, sea ice, permafrost, snow cover); polar ice sheets hold about 69% of Earth's fresh water; if all polar ice melted, sea levels would rise over 65 metres; and the water cycle connects polar ice to the global system through evaporation, precipitation, and meltwater flowing into oceans

学习证据 / Evidence

• 将冰冻圈定义为地球上所有冻结的水，并说出其组成部分：冰盖、冰川、海冰、永久冻土和积雪。
• 说明极地冰盖储存了地球上约69%的淡水。
• 解释极地冰如何与全球水循环相连，以及如果所有极地冰融化会发生什么（海平面上升超过65米）。

• Define the cryosphere as all frozen water on Earth and name its components: ice sheets, glaciers, sea ice, permafrost, snow
• State that polar ice sheets hold approximately 69% of Earth's fresh water
• Explain how polar ice connects to the global water cycle and what would happen if it all melted (65m+ sea level rise)

评估问题 / Assessment

{{name}}是否知道，地球上大部分淡水其实被封存在极地的冰里——如果这些冰全部融化，海平面会上升超过65米，淹没世界各地的沿海城市？

Does {{name}} know that most of Earth's fresh water is actually locked up as ice at the poles — and that if it all melted, the sea would rise over 65 metres, flooding coastal cities worldwide?