what are the eight facts on the barberton makhonjwa mountains?
['The Barberton Makhonjwz Mountain land is the first UNESCO world heritage site in the province Mpumalanga.', 'It shares border with Gauteng and Limpoo.', 'These mountains are also known as Barberton mountains or Barberton Greenstone Belt.', 'They contain oldest and best preserved volcanic and sedimentary rocks on the planet.']