碳循环
The Carbon Cycle
描述碳循环，追踪碳通过光合作用、呼吸作用、进食、分解和燃烧的路径，并解释每个过程的作用。
Describe the carbon cycle, tracing carbon through photosynthesis, respiration, feeding, decomposition, and combustion, and explain the role of each process
学习证据 / Evidence
- 画出或标注碳循环示意图，展示主要过程
- 解释光合作用如何从大气中吸收二氧化碳
- 解释呼吸作用、燃烧和分解如何将二氧化碳返回大气
- 讨论人类活动（如燃烧化石燃料、砍伐森林）如何干扰碳循环
- Draws or labels a diagram of the carbon cycle showing the main processes
- Explains how photosynthesis removes carbon dioxide from the atmosphere
- Explains how respiration, combustion, and decomposition return carbon dioxide to the atmosphere
- Discusses how human activities (burning fossil fuels, deforestation) disrupt the carbon cycle
评估问题 / Assessment
如果{{name}}被问到一张木桌里的碳最初来自哪里，能否追溯它的碳循环旅程——从大气中，经过植物，进入树木，再重新释放出来？
If {{name}} was asked where the carbon in a wooden table came from originally, could they trace its journey through the carbon cycle — from the atmosphere, through a plant, into the tree, and back out again?