 The earth is the only planet of the solar system which have the suitable condition for the life because it has suitable environment. So this environment is actually because of the distribution of the land and water. The most of the area is covered by the water which is 71% of the total whereas 29% of the total area of the planet is covered with the earth which is called the land. So there are eight planets of the solar system. Total number of the family of the solar system is 9 but the most important part of or the component of the solar system is the Sun. So Sun is the major star whereas other bodies or objects which are actually the evolving around the star are the planets. So Sun is a star and other objects are planet. There are two groups in the family of the solar system. The first four are called the inner planet whereas the other four are called the outer planets. The first four planets are Mercury, Venus, Earth and Mars. Now the diameter of these four planets are Mercury has 4,875 kilometers in diameter whereas Venus has 12,104 kilometers. The Earth's diameter is the 12,756 kilometers whereas Mars is 6,780 kilometers. The average distance increases when the increases from Mercury to the Mars or to the end of the system. So the first one which is called the Mercury, it has an average distance from the Sun is about 58 million kilometers whereas the Venus has 108 million kilometers and the Earth has 150 million kilometers at the distance from the Sun whereas the Mars distance from the Sun is 228 million kilometers. All the inner planets are rotating around its own axis. The Mercury rotates around its own axis in 58.6 days whereas Venus rotates around its own axis in 243 days and the Earth rotates around its own axis in about 24 hours whereas Mars rotates in 24.62 hours. So the Earth is one of the fastest spinning body among inner planets. Now the revolution period is actually the Mercury has 88 days completed is one revolution around the Sun. Venus complete its journey around the Sun in two 24.7 days. Earth completes 365.26 days whereas Mars completes its journey around the Sun which is called the revolution of the Mars in single revolution is in 687 days. So journey increases because of the distance from the Sun. Now the surface temperature of these four inner planets are Venus has the highest temperature among all whereas Mercury has minus 180 degree Celsius to 430 degree Celsius whereas Earth has minus 70 degree Celsius to 55 degree Celsius and the Mars has minus 20 degree Celsius to 25 degree Celsius. So among these inner planets Venus has highest temperature because it's the slowest rotating body. So that's why it has highest temperature among all. Now the radius of the Earth is 6371 kilometers. So however the Earth's rotational speed is one triple six kilometer per hour which is 37 times more than the speed of the bullet causes bulge at equator. So we see that the Earth is roughly spherical because of the fastest spinning body. So that's where the most of the area have at equator, it's outwards. So the speed is very high because of the bulge. Now the most prominent thing over the Earth are the highest top of the planet. Now this is Mount Everest is the highest top on the surface of the Earth which is about 29,000 and 28 feet above sea level. So this is the highest peak which is actually in Nepal. The lowest point on the Earth is the Mariana Trench in the western part of the Pacific Ocean. Its depth is about 36,200 feet below sea level. So this is actually to the south of the Japanese island. So the Earth is the denser planet in the solar system because of its metallic core and rocky monitor. The surface of the Earth is covered with the crustal area which is called the earth crust. But the below surface we have most of the area in liquid and most of the solid part.