Last updated on November 26th, 2017
Extinction of species, naming of Earth, length of day, magnetic field, temperature at core, density
#19. It is a fascinating fact to note here that 99% of all species that ever existed on the Earth are now extinct.
#20. Earth is the only known planet that supports life. However, attempts are underway to help life survive on other planets like Mars.
#21. It is also the only planet not to be named after a Greek or Roman god. Jupiter is named after the king of Roman gods and Uranus is named after the Greek god of the sky. The name Earth comes from English/german, which means the Ground.
#22. The speed of rotation of Earth is gradually slowing down; meaning that in some 140 million years from now, the length of a day on Earth would be 25 hours.
#23. Earth was once believed to be the center of the Universe and scientists believed that the Sun and other planets revolved around it. However, this assumption was proved incorrect.
#24. Because of the presence of inner Nickel-Iron core, Earth has a strong magnetic field. This magnetic field is also responsible for preventing heavy solar winds from blowing on the Earth and causing damage to various life forms.
#25. Earth’s inner core has a temperature between 5400 and 6000 degrees Celsius. Thus, making it hotter than the surface of the Sun (surface temperature – 5500 Celsius).
#26. The thickest of all the four layers of the earth is the mantle, which is 2900 kilometers thick. This layer has a consistency of caramel and is composed of a hot mixture of molten rock.
#27. The thinnest of all the layers is the crust, which is on an average 30 kilometers deep on an average on the ground.
#28. Earth also has the largest natural satellite as compared to any other planet considering the size of Earth and the moon (the Moon is approximately 27% the size of the Earth.)
#29. The Earth also has the credit of being the densest planet in the Solar System. It has an average density of 5.51 grams per cubic centimeter.
Tectonic plates, shape of earth, bluish appearance, atmosphere, oxygen
#30. Earth is the only planet in the solar system that has tectonic plates underneath its surface. These plates are floating on top of the magma inside of the Earth. When these plates collide, earthquakes happen. Movement of these plates is also very important for other geological and life supporting purposes.
#31. The diameter of Earth from the North Pole to the South Pole is shorter than its diameter across the Equator by 43 km. Thus, Earth is not a perfect sphere and this difference in the diameter is the results of Earth’s rotation.
#33. Earth is also known as the “Blue Planet” because of its bluish appearance from the outer space. Almost 70% of Earth’s surface is covered with water.
#34. There are five layers in Earth’s atmosphere including – the Troposphere, the Stratosphere, the Mesosphere, the Thermosphere, and the Exosphere. Earth’s atmosphere is the thickest from ground level up to a height of 50 km and extends up to 10,000 km.
Also read: facts about Uranus
#35. Airplanes fly at a maximum altitude of 60,000 feet which is almost 18.288 km.
#36. The pressure and density go on decreasing as we move farther away from Earth’s surface and travel towards space.
#37. The first 11 km from the Earth’s surface has 75% of the atmosphere.
#38. The last layer of the Earth’s atmosphere – the Exosphere – extends from 700 km above mean sea level to 10,000 km in outer space.
#39. Did you ever wonder why we have a leap year every four years? This is because a year on earth is not exactly 365 days but it is 365.2564 days. This extra 0.2564 day is adjusted with an extra day (leap day) in the month of February every four years.
#40. Earth is the only planet that contains 21% oxygen in its atmosphere and liquid water on its surface.
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