How to Use "occurrence" with Example Sentences

1. The interspersing layers of ash show they were a regular occurrence .
2. If this is a first or second time occurrence , let it go .
3. The mutation is a natural occurrence , as is the reaction to the drug .
4. Munsch says that each relationship is still unique , and infidelity remains a relatively uncommon occurrence .
5. Writing in science , they said fire occurrence rates had increased in 59 % of areas with reduced deforestation .