1) The Arctic Ocean is the smallest and shallowest ocean, located at the North Pole. It is covered by sea ice for much of the year.

2) The abolition of slavery in the United States was officially proclaimed with the ratification of the 13th Amendment to the Constitution in 1865.

3) The Great Barrier Reef in Australia is the largest coral reef system in the world and is visible from space.

4) A group of flamingos is called a "flamboyance."