大气层

了解地球被一层叫作大气层的空气所包围；空气有重量并会产生压力；大气层能保护我们免受有害辐射，并让地球保持适宜生命存活的温度；天气发生在大气层最低的一层（对流层）中。

Know that Earth is surrounded by a layer of air called the atmosphere, that air has weight and exerts pressure, that the atmosphere protects us from harmful radiation and keeps the planet warm enough for life, and that weather happens in the lowest layer (troposphere)

学习证据 / Evidence

• 将大气层定义为环绕地球的空气层
• 说明空气有重量并会产生压力
• 解释天气发生在大气层最底部的对流层中

• Define the atmosphere as the layer of air surrounding Earth
• State that air has weight and exerts pressure
• Explain that weather occurs in the troposphere, the lowest layer of the atmosphere

评估问题 / Assessment

{{name}}能解释我们被一层叫作大气层的空气包围着、这层空气其实有重量并且会向所有东西施加压力、而且所有天气都发生在大气层最底层吗？

Can {{name}} explain that we're surrounded by a blanket of air called the atmosphere, that this air actually has weight and pushes on everything, and that all our weather happens in the lowest layer?