Why did mt Everest become a world heritage site?

Mount Everest (as a part of Sagarmatha National Park) became a World heritage site under criteria vii. It is an area of exceptional national beauty including mountains, glaciers and deep valleys. It is home to rare species such as the snow leopard and the red panda. it is one of the most geologically interesting places on earth representing one of the major stages of evolution of the earth. It is home to the highest ecologically characteristic flora and fauna in the world and is intricately weaved into the local Sherpa culture.