Earth and the atmosphere

Earth
Is the only know planet that has life. Why ? Here is your answer.
We are not to far away or to close to the sun ,making temperature
just right to live in. The atmosphere also helps . It traps the suns
 heat rays but deflects ray that could hurt us. The atmosphere is made
 up of gases that include oxygen and nitrogen . Many living things
need oxygen to survive including us :). There are 5 layers of the atmosphere
 (the higher you go the thinner the air gets)  they are :


The Exosphere_________________________________________
Is the highest and thinnest layer                                                                                                        

The Thermosphere   _____________________________________
Is the hottest layer. There is very thin air here to .

The Mesosphere ________________________________________
Here is where most meteors get dissolved. This is the coldest layer.

The Stratosphere________________________________________
The Ozone layer is here.

The Troposphere________________________________________
This is the lowest layer . This is also called the weather layer.
--/\______________/\____/\_______________|


Another thing that helps life on earth is the water. 71% of the earth is water. All living things need water to survive . Earth is the 5th largest planet in the Solar system making its gravitational pull not to strong or to weak. Earth also has a magnetic field because of the core. Scientist think that the magnetic field defends us from harmful rays.

Source: Brainpop