Earth..

Hello,
I was wayyyyyyy too busy to even think about doing the blog, I bet you were thinking that I was one of thsoe people who start something and forget it later on, no, I was a little busy..and no you don't have to go to another non - amusing (NOT THAT THIS BLOG IS ANY AMUSING ANYWAY) astronomy site to know about astronomy.

Today we're starting on Earth. Tell me..what do you know about the Earth?
My guess you will probably say the following, like I did the first time:

* It's the third planet from the Sun.
* Orbits as a mean speed of 150 million km, 1 AU.
* Only planet in out Solar System that has life.
* Has Seasons

But here are some facts about Earth:

•Mass of Earth is 6 x 10^24 kg and its density is 5,520 kg/m^3
*Earth is a oblate spheriod, it's squashed circle.
* Earth is closest to the Sun in Perihilion, which is in January, and Earth is furthest to the Sun in Aphelion, Which is in Earyl July.
You might think that seasons appear as the Earth moves towards, and away from the sun, however this is not the case, in reality northern winter takes place when the Earth is closest to the Sun. However, seasons takes places beuase fo the obliquity of the Earth.

Interior of the Earth:

Crust - Is made up of silicate rocks, Oceanic crust contains basaly, and continental crust contains granite.

Mantle - Contain liquid silicate rock (peridotite) that moves very slowly.

Outer Core - Liquid Iron, and lighter elements.

Inner core – solid iron-nickel alloy at temperature of 6400 K, similar to Sun’s surface.

Core responsible for Earth's global magnetic field
Density: continental crust <>