Tamil Nadu was formed by the reorganisation of the Madras State. Agriculture is the main occupation of the people. Total area under cultivation is 6.56 million hectares and the principal crops are rice, millet, maize, pulses, sugarcane, cotton, oilseeds, coconut, cashews, groundnut, tea, coffee, rubber and cardamom. The major industries are heavy commercial vehicles, auto components, railway coaches, power pumps, leather, cement and sugar etc. Mineral resources of the State include limestone, lignite, magnesite, mica, gypsum, black granite, quartz, salt and bauxite. Chennai and Tuticorin are the major ports. Tamil Nadu has long, hot summers, and warm winters.The average rainfall is 102 cm.