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steve jazwiec

on 28 February 2013

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Transcript of Earth

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli Earth What is earth? Earth has five different layers Inner Core, Outer Core, Lower mantle, Upper Mantle and Crust Earth`s layers The core is made up of a solid iron-nickel alloy with a few trace elements Rotation The earth rotates about an imaginary line that passes through the North and South Poles of the planet. This line is called the axis of rotation. Earth rotates about this axis once each day (approximately 24 hours) Fun Facts Earth is the only planet in the Solar System with plate tectonics. You tube Video Earth`s rotation around the sun. The planet on which we live, the third planet from the sun in the solar system. The earth`s mantle is made up of a thick, solid, rocky substance that represents about 85% of the total weight and mass of the Earth. The crust is made up of different types of rocks; igneous, metamorphic, and sedimentary rocks. Youtube Video If you separate the Earth out into piles of material, you’d get 32.1 % iron, 30.1% oxygen, 15.1% silicon, and 13.9% magnesium. Mostly iron. <img src="http://1.bp.blogspot.com/_57jRgDt4zro/Sb0Mf-ECbMI/AAAAAAAAAZE/GDKD8gQaOas/s400/Earth's+Interior+4+Layers.jpg" alt="Earth&#39;s+Interior+4+Layers.jpg (400×266)"/>
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