为什么极地季节如此极端
理解为什么极地会出现极端的季节变化：地球的地轴倾斜约23.5°，因此在绕太阳公转时，每个极地有一半时间朝向太阳（白昼持续、夏季较暖），另一半时间背向太阳（黑夜漫长、冬季严寒）。这种倾斜还驱动了海冰每年冬季扩张、夏季消退的循环，并引发动物迁徙、繁殖等行为。
Understand why the poles have extreme seasons — Earth's axis is tilted at about 23.5°, so as it orbits the Sun, each pole spends half the year tilted toward the Sun (continuous daylight, warmer summer) and half tilted away (continuous darkness, bitter winter); this tilt also drives the annual cycle of sea ice expanding in winter and retreating in summer, and triggers animal behaviours like migration and breeding
学习证据 / Evidence
- 解释地球的地轴倾斜约23.5°，正是这种倾斜导致了极地极端季节的出现。
- 描述这种倾斜如何使每个极地半年面向太阳（夏季/白昼），另外半年背向太阳（冬季/黑夜）。
- 将季节变化与至少一种动物行为联系起来，例如迁徙，或海冰消退对捕猎的影响。
- Explain that Earth's axis is tilted at about 23.5° and this tilt causes the extreme polar seasons
- Describe how the tilt means each pole faces toward the Sun for half the year (summer/daylight) and away for the other half (winter/darkness)
- Connect the seasonal cycle to at least one animal behaviour, such as migration or sea ice retreat affecting hunting
评估问题 / Assessment
{{name}}能解释为什么极地在夏季有持续数月的白昼，在冬季有持续数月的黑夜——这是因为地球绕太阳运行时的地轴是倾斜的吗？
Can {{name}} explain WHY the poles have months of daylight in summer and months of darkness in winter — that it's because Earth is tilted on its axis as it goes around the Sun?