earth

Earth is the only plantet whose english and does not devine from a greek/mythology. The name derives from old english and germanic.Earth, of couse can be studied with out aid of space craft. It was not until the 20 century thet we had maps for the entire planet.The pictures taken are extremely helpful for example weather predicitons and especially tracking hurricanes or torpedos. The core in the earth is mainly composed and made out of iron. Although, it is possible that some lighter elements may be presented too. The earth is the most densest planet in our solar system. The earthsatmosphere is 77% and the earths oxygen is 21% with traces of argon, carbon dioxide and water. Earth only has one moon and the name of earths moon is known as luna.
 * //__Earth__//**

[|orbit]: 149,600,000 km (1.00 [|AU]) from Sun [|diameter]: 12,756.3 km [|mass]: 5.972e24 kg

34.6% [|Iron] 29.5% [|Oxygen] 15.2% [|Silicon] 12.7% [|Magnesium] 2.4% [|Nickel] 1.9% [|Sulfur] 0.05% [|Titanium]

The atmosphsurrounds the earth ere and prostects us by keeping out deadly sun rays. the atmosphere is made from gases which gradually becomes thinner and goes out of space. the atmosphere is made of nitrogen (78%), oxygen (21%) and other gases are (1%). oxygen is good for us because it alows us to breathe so we can recieve air in our lungs to live everyday, some of the oxygen has changed by the ozone. the ozone layer takes out the suns ray and there have been recent studies on how humans have caused these holes in the ozone layer.

Earth is the most largest and most densest rocky planet, and it was formed about 4.5 billion years ago. The earths interior is divided into four layers and they are: the inner core, the outer core, the mantle and the crust. Each layer has its own characteristics and is made up of different elements and minerals. The surface is most unique because it is the only planet that has water liquid over it in such large areas.



70 percent of the earth is mainly covered of water, and 97% part of that is mainly salt ocean water, not much of the earths water is fresh water thats is why we use dams. we need frwesh water everyday because we need it for drinking, farming and especially for washing. without water, life as we call it wouldn't even exist. one way to explore water is by scuba diving. another way is to use a deep blue see submerible like the alvin. the alvin was the first submersil in the deep blue sea.it wsa designed by scientist to observe the floor of the deep blue sea. the trenches in the deep blue see were also trenched between the years of 1964 and 1999 the alvin made over 3500 dives and the averaqge dive was 1,28 miles (2,055 metres). the alvin helped scientist with there research of what happens in the under water world with geology, biology, and chemistry.

As you can see here there are many types of layers in the earth. the main ones are the inner core, the outer core, the mantle, the crust and the liothosphere. in the picture on the right hand side there is the asthenosphere, the continental crust, the oceanic crust, the lowe mantle, and the mohorovicic discontinuity.