CURIOSITIES

1- The Earth is not a perfect sphere
It usually represents our planet as a perfect sphere, but that is not its precise form. The Earth is flattened at the poles, so that its shape is more like an ellipse to a circle.Like other planets, the effect of gravity and centrifugal force produced by the rotation on its axis generates the polar equatorial flattening and widening. Thus, the diameter of the Earth in Ecuador is about 43 kilometers greater than the diameter of one pole to another.
 
.2- Water covers over 70% of the Earth
Water covers three quarters of the Earth's surface.On Earth, water is in solid, liquid and gaseous state.It also covers three quarters of the Earth's surface as swamps, lakes, rivers, seas and oceans.The oceans contain about 97% of all water on the planet.



3- The boundary between Earth and space is at 
100 km   
It is believed that the border between the atmosphere and space is called Kármán line, which is 100 km altitude.75% of atmospheric mass is in the first 11 km in height from the sea surface.The Earth is a planet of iron.The core of the earth is made mostly of iron.The Earth is the densest and fifth largest planet in the Solar System.The sciencist beleive that the core is made up of 88% of iron.
 

5- The Earth is the only planet with life
The Earth is the only astronomical body where you have seen that there is life.There are currently about 1.2 million species of animals cataloged, but scientists believe that this is only a small percentage of the total.The Earth formed makes about 4,500 million years ago and life has been present in it for much of that period.The physical properties of the Earth, its geological history and orbit, have allowed life has existed for millions of years.
 
6- The gravity is not equal everywhere on Earth
 There are variations in the value of the gravitational field of the Earth.Earth actually has the shape of sphere, but a shape close to an ellipse.In addition, ground floor is uneven and the mass of our planet is not distributed in a perfectly homogeneous.This means that there are variations in the value of the gravitational field.For example, to go moving from Ecuador to the poles, gradually increasing the intensity of the gravitational field, although the difference is imperceptible to humans. 


 7- The Earth is a planet of extremes 
Our planet is full of contrasts. The variety of geographical areas and climates, makes virtually every region has its own peculiarities.There are several candidates for consideration of the warmest places on Earth, but the place with the highest ever recorded temperature is in the Valley of Death in the US, where the 10 of July in 1913 the thermometer rose to 56.7 ° C.At the other extreme is the Antarctic. At Vostok station on 31of July in 1983 trhe thermometer marked -89.2 ° C.

 

 

8- The largest living structure on Earth
The Great Barrier Reef is home to thousands of organisms.
The Great Barrier Reef, located off the coast of Australia, is the largest single structure made by living organisms on the planet to the point that it is the only one that can be seen from space.It stretches over 2,000 kilometers and is home to thousands of marine species. In 1981, it was declared a World Heritage Site by Unesco
                 
9- The Earth is the only planet in the solar system with active tectonic platesThe movement of these plates causes the surface of our planet is changing, being responsible for the formation of mountains,earthcuakes and volcanos.The cycle of these plates also plays an essential role in regulating the Earth's temperature, contributing to the recycling of greenhouse gases such as carbon dioxide, through the ongoing renewal of the ocean floor.The Earth has a protective shield.The Earth's magnetic field acts as a shield.The Earth's magnetic field acts as a shield against the continuous bombardment of particles from the sun.This field extends from the inner core of the Earth to the edge where it meets the solar wind.Among other things, the magnetic field orientation also helps some animals as ours, with the use of compasses.



 11. The water bears off Earth
                                                                                                        
The tardigrades are commonly known as water bears by the way they move, similar to a bear. It is the animal more resistant of the planet.Have a size between 0.05 and 1.5 millimeters.

Tardigrades, for example, survive more than 10 minutes in the absolute vacuum. This is undoubtedly the most surprising of which we have knowledge animal, commonly called the water bear and have millions alone in your garden.

 Also has comprobated that when in state of cryptobiosis has been found to withstand temperatures between 200 degrees Celsius for days, or 272 degrees Celsius.