Earth's structure

    Today's blog is about Earth's structure and the layers of the Earth.I blog about how thick each layer of the Earth is and what they do.


First is the top layer the crust.The crust is about 35 kilometers thick on land.The crust is 15 kilometers thick at the bottom of the ocean.The crust is the layer we live on.It is cool hard rock so we can live on it.It contains tectonic plates that move the continents.
 

The next layer is the Mantle.The mantle is the thickest layer of the Earth.The mantle is about 2850 kilometers thick.The mantle is made up of melted rock.It is about 4000 degrees in the mantle.


Next is the outer core.The outer core is made up of iron and nickle.The outer core is the only layer of the Earth that is all liquid.It is about 2,200 kilometers thick.


Last is the inner core.The inner core is a ball of solid iron.It is compressed together so hard that it never melts even though it is as hot as the surface of the sun.

There is a movie called the core and I think it is cool.There is a link down at the bottom and some other stuff.


http://youtu.be/foAyvN6mVwQ
http://youtu.be/RiHRI_Z2Kgs
http://youtu.be/Q9j1xGaxYzY