1) The Indian Ocean is the third-largest ocean and is characterized by its warm waters and diverse marine life.

2) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active. It stands over 13,000 feet (4,000 meters) above sea level.

3) Antarctica is the coldest, driest, and windiest continent on Earth. It is also the highest, with an average elevation of about 7,545 feet (2,300 meters).

4) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.