Describe at least two ways that carbon can get from seashells to the atmosphere

Ways that carbon can get from seashells to the atmosphere:

First: Crashing of tectonic plates.

Second: Odd belching of volcanos.

Third: Cement Production, it will release carbon to the atmosphere.  

Explanation:

Carbon from living organisms can end up deep underground.  Over very long periods of time and huge pressure the carbon from seashells from things like long-dead coral become limestone.

With natural conditions, it can take millions of years to go back to the atmosphere the Carbon with natural geological and chemical process such as:

First: Crashing of tectonic plates.

Second: Odd belching of volcanos.  

Besides that, we can have other processes such as:

Third: heating limestone to produce cement, it will release carbon to the atmosphere.

Finally, we can conclude that the Ways that carbon can get from seashells to the atmosphere:

First: Crashing of tectonic plates.

Second: Odd belching of volcanos.

Third: Cement Production, it will release carbon to the atmosphere.