1) The word "piano" contains three vowels: I, A, and O.

2) The hibiscus flower is commonly associated with tropical regions and is the national flower of several countries, including Malaysia, South Korea, and Haiti.

3) Insurance policies often contain exclusions, which are specific events or circumstances that are not covered by the policy.

4) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.