Teacher: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. 
Teacher: Now, understand the problem? Solve this instance:  "process paragraph : : Plants and animals long ago died. They are buried under layers of soil. Pressure builds over time. The remains liquefy. The carbon atoms rearrange to become a new substance. ", "event : They are buried under layers of soil.", "entity : plants" 
Student:
 not exist 