水循环

理解水循环：太阳加热海洋和湖泊中的水，使其蒸发成水蒸气；水蒸气上升后冷却形成云（凝结）；水以雨、雪或冰雹的形式落回地面（降水）；然后循环周而复始。

Understand the water cycle: the Sun heats water in oceans and lakes causing it to evaporate into water vapour, the vapour rises and cools to form clouds (condensation), and water falls back to Earth as rain, snow, or hail (precipitation) — then the cycle repeats

学习证据 / Evidence

• 说出水循环的三个主要阶段：蒸发、凝结、降水
• 解释太阳在驱动水循环中的作用
• 将水循环描述为一个没有起点和终点的持续循环

• Name the three main stages: evaporation, condensation, precipitation
• Explain the Sun's role in driving the water cycle
• Describe the water cycle as a continuous loop with no beginning or end

评估问题 / Assessment

{{name}}能描述一滴雨滴的旅程吗——从海洋中的水被太阳加热，变成看不见的水蒸气上升，形成云，再变成雨落回地面——并说明这个过程会一直循环往复吗？

Can {{name}} trace the journey of a raindrop — from the ocean being heated by the Sun, rising as invisible vapour, forming a cloud, and falling back down as rain — and explain it keeps going round and round?