Some minerals in rocks and organic matter for example bones and shells can contain radioactive isotopes. Any of parent and daughter isotopes in a sample can be measured and used to determine their age. This is known as radiometric dating.
En colombia está el arroz con leche, postre de maracuya en argentina está el arequipe ,en cuba está la Natilla de vainilla, pastel de limón, en España está dulce de leche