The air has it because of the machines we use and the oxygen in the air.
The sea creators that go in and out of the ocean or water bring oxygen with them.
There are different Layers in the earth so a trillion years old a some just a thousands of years old.
Carbon dioxide is added to the atmosphere naturally by respiration animals breathe in oxygen and exhale carbon dioxide.
The ocean takes up carbon dioxide through photosynthesis by plant-like organisms phytoplankton, as well as by simple chemistry: carbon dioxide dissolves in water.
Fossil Fuels are the things we use to burn so like: Coal, wood, and even metal.
Carbon dioxide gets washed out of the atmosphere by rainwater where it combines with calcium in the Earth's crust and oceans to form carbonates.
Soil respiration is a key ecosystem process that. releases carbon from the soil in the form of carbon dioxide.Carbon is stored in the soil as organic matter and is respired by plants, bacteria, fungi and animals.
The plants take the oxygen and it goes through the soil to the plants rots
When fossil fuels are burned, oxygen combines with carbon to form CO2 and with hydrogen to form water (H2O). These reactions release heat, which we use for energy.
The plants absorb carbon dioxide for photosynthesis through the same pores called stomata. But when carbon dioxide levels are high, the leaf pores shrink. This causes less water to be released, diminishing the tree's cooling pow.
Goes through the plants which the animals then eat going through everything again.