Natural causes of _________________________ include volcano emissions,lightning,and microbial processes.

Microbial Processes

These are biological reactions and activities carried out by microorganisms, playing critical roles in recycling nutrients in the environment.

Volcano Emissions

The release of gases, ash, and molten rock from a volcano, which can significantly impact air quality, climate, and the health of nearby ecosystems and human populations.

Lightning

An electrostatic discharge during a thunderstorm that results in a bright flash of electricity traveling between clouds or between a cloud and the ground.