What two recurring events in earth's history have an impact on the carbon cycle?

1.volcanoes erupt.

2. Fossil formation.

Explanation:

1. The volcanoes vent gas to the atmosphere, they emit between 130 and 380 million metric tons of carbon dioxide per year.

2. Heat and pressure compress organic carbon (carbon from living organisms) embedded in layers of mud. By this process sedimentary rocks are formed.

b exhibiting favoritism toward the kikuyu people.