Earth is a small rocky planet which supports a variety of life! As far as we know, Earth is unique from all other planets in this respect.
Temperatures at the Earth's center (called the "core") may be as high as 7500 K - That's hotter than the surface of the Sun !
The Earth is the densest major body in the solar system. This means that it's the most "compact" of all the planets. For example, you have two loaves of bread, both of the same amount. You smash one loaf of bread flat. Even though both loaves are of the same amount, the smashed bread is *denser* because it is more compact.
The Earth is 4.5 to 4.6 billion years old, but the oldest known rocks are less than 4 billion years old. Rocks older than 3 billion years are rare. The oldest fossils of living organisms are less than 3.9 billion years old!
71 % of the Earth's surface is covered with water. Earth is the only planet on which water can exist in liquid form on the surface. Water is essential for life as we know it. The Earth's vast oceans keep temperatures stable - important for life on our planet. Water is also responsible for most of the erosion and weathering of the Earth's continents, a process unique in our solar system.
Earth is the third planet from the sun, and the fifth largest of the nine planets.