Plants are super important because they help make up the biosphere. They take in carbon dioxide (CO2) from the air to make their food through a process called photosynthesis. It’s pretty cool! When plants breathe out, they release some of that CO2 back into the air. When plants die, their carbon gets put into the ground and can eventually turn into fossil fuels over a really long time. Then when we burn those fossil fuels, they send CO2 back into the atmosphere.
Some CO2 also mixes with water, turning into something called carbonic acid. And don’t forget about aquatic plants! They do their own photosynthesis and breathing too. All this movement of carbon connects different parts of the Earth, like the land (lithosphere), the air (atmosphere), and the water (hydrosphere). It’s like a big team effort!