In Moray the Incas used some funnel like craters where specific geographical conditions result in enormous temperature differences from the bottom to the top of the crater, up to 12 degrees Celsius. They built terraces in the slopes and it is believed that the Incas used these terraces to breed new kinds of crop, most important acclimatizing corn to high altitudes. Maybe they even covered the walls in silver and gold to create even higher temperatures in the craters. Hence Moray is also called the „Inca Laboratory”.