Earth is the only planet that has liquid water on its surface, it is 93 million miles from the sun, and the Atlantic Ocean is the saltiest of the oceans. Earth is a unique planet in the solar system.
Earth has unique geological features. Mount Everest is the highest mountain on the planet. The rocks at the bottom of the Grand Canyon may be two billion years old. Magma is hot liquid rock under Earth's surface and appears as lava when a volcano erupts. Talc is the softest mineral on Earth. Hawaii moves 10 centimeters closer to Japan every year due to the movement of tectonic plates. Earth is slightly flat at the North and South poles. The planet has fewer craters than Mars, Venus and Mercury due to its geological activity.
Earth also has unique geographic features. The Sahara is the largest desert outside of the polar regions and covers almost a third of the African continent. The planet's surface is 70 percent water, and earthquakes under oceans may cause tsunamis. The Nile is the longest river at 4,160 miles long. The Amazon in South America is the largest rain forest and the Great Barrier Reef in Australia is the largest living structure.