Science

Carbon cycle

In Class 9 Science, this topic explains how carbon continuously moves through Earth’s systems, connecting the atmosphere, plants, animals, soil, oceans, and rocks. Students learn how photosynthesis removes carbon dioxide from the air, while respiration, decomposition, and combustion return it. As part of “Earth as a System: Energy, Matter, and Life,” the carbon cycle shows how matter is reused, supports food webs, and influences climate. It also introduces how human activities can disturb this natural balance.