Plate tectonics Columbia or Nuna formed during a period of and broke up about . The supercontinent Rodinia is thought to have formed about 1 billion years ago and to have embodied most or all of Earth's continents, and broken up into eight continents around . The eight continents later re-assembled into another supercontinent called Pangaea; Pangaea broke up into Laurasia (which became North America and Eurasia) and Gondwana (which became the remaining continents). The Himalayas, the world's tallest mountain range, are assumed to have been formed by the collision of two major plates. Before uplift, they were covered by the Tethys
Gondwana Choirs Gondwana Choirs Gondwana Choirs is an Australian national children's choir organisation. It was founded in 1989 as Sydney Children’s Choir by Lyn Williams OAM, who is its artistic director, and is located in Millers Point, New South Wales. Gondwana Choirs has three divisions, Sydney Children's Choir, Gondwana National Choirs and Gondwana Indigenous Children's Choir, and includes several different choirs: Gondwana Choirs auditions nationally and meets in January for a two-week camp of intensive rehearsal. Choirs then typically undertake one or more tours during the year. Gondwana Choirs also runs a Composer School and a Conducting Internship, and commissions works from