Earth is the third planet in the solar system. It is the only planet where life exists and is our home. It is 4.5billion(4,500,000,000) years old. The diameter of the earth is 12,756 km. The mass of the earth is 5.96219 × 10^24 kg. The gravity of the earth is about 9.8 m /s^2. The Earth has a maximum temperature of 56°C, a minimum temperature of -89°C and an average temperature of 15°C.Its atmosphere contains 79.06% nitrogen, 20.95% oxygen, 0.930% argon, 0.039% carbon dioxide. 71.92% of the earth is water and 28.08% is soil. There are green plants on the surface of the earth, but there is a sea of oceans, but inside it is a sphere of burning fire. The temperature at the center of the earth is 7500°C which is warmer than the surface of the sun. Earth is the only planet where water is available in three states (solid, liquid, gaseous). Some unknown things :Life is transmitted here 150 million years ago. Its rotational speed is gradually decreasing. 1 ...
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