Answer:
forest fires.
Step-by-step explanation:
Carbon on Earth is found in both living and nonliving matter. In order for carbon to be continuously available, it must be recycled. The process through which carbon is made available in the atmosphere is through forest fires.
The burning of forest trees and plants is known as combustion.
Combustion can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.
This ultimately implies that, the burning of a forest (forest fires) makes carbon available in the atmosphere. It is usually released in the form of either carbon dioxide or carbon monoxide.