In this task, you are given a paragraph, event and an entity. The event is part of the given paragraph and it changes the state of the entity. Your task is to classify the state of the entity into three classes: 1) not exist, 2) unknown location and 3) known location. "not exist" means the entity doesn't exist in that state anymore. "unknown location" means the entity exists in that state but location is unknown. "known location" means the entity exists and location is known. 
Q:  "process paragraph : : An animal lives a happy life. The animal gets very old. The animal dies. The animal's skeleton sinks to the bottom of an ocean. The skeleton is buried by mud. More sand and mud fall on the skeleton. Pressure increases on the skeleton from the weight of more mud. The sand and mud turn into rock. The skeleton dissolves in the water. A hole is preserved in rock that is the shape of the skeleton. ", "event : The animal gets very old.", "entity : animal" 
A: 
 unknown location 