Earth is the only planet in the solar system not named after a Roman or Greek deity. The hottest recorded temperature is 136 degrees Fahrenheit. Scientists believe that Earth once had two moons. The longest mountain range on the planet is underwater and is called the mid-ocean ridge.
Earth's most active erupter volcano is called the Stromboli Volcano and is located in southern Italy. It has been erupting almost continuously for the past 2,000 years and is nicknamed the "Lighthouse of the Mediterranean." Earth was formed 4.54 billion years ago and is the only known planet in the solar system to support life. Oceans cover 70 percent of the planet Earth, but humans have only explored 5 percent of the oceans.