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					 			      	National Geographic Kids - Structure of the Earth
					 			      	 
 Learn all about the structure of the Earth here at National Geographic Kids! Join us as we explore the different layers - the crust, upper mantle, lower mantle, outer core and inner core. http://www.ngkids.co.uk/science-and-nature/structure-of-the-earth
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					 			      	Structure of the Earth: Crust, Mantle and Core - YouTube
					 			      	 
 This Youtube video shows the viewer the structure of the earth's crust, mantle and core. https://www.youtube.com/watch?v=YxGgkF582rI
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					 			      	BBC - GCSE Bitesize: The Structure Of The Earth
					 			      	 
 A secondary school revision resource for OCR GCSE Science about rocks, metals and the Earth's structure. http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway_pre_2011/rocks_metals/3_does_the_earth_move1.shtml
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					 			      	Structure Of The Earth - Plate Tectonics - Khan Academy
					 			      	 
 How do scientists know about the core if they can't go down there? Your questions are answered here. https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/plate-techtonics/v/structure-of-the-earth
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					 			      	Earth's Internal Structure - Crust Mantle Core - Geology
					 			      	 
 The earth's internal structure from geology.com. http://geology.com/nsta/earth-internal-structure.shtml
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					 			      	Earth's Structure - Brain PoP
					 			      	 
 We all know what happens on the surface of the earth, but what happens beneath the surface? Learn about your planet's internal structure! https://www.brainpop.com/science/earthsystem/earthsstructure/
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					 			      	Visionlearning - Earth Science - Earth Structure
					 			      	 
 The layers of Earth can be described by what they are made of and how they behave. Learn what these layers are and how scientists determined where they are. http://www.visionlearning.com/en/library/Earth-Science/6/Earth-Structure/69
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					 			      	Geography 4 Kids: Earth Structure
					 			      	 
 This tutorial introduces basics of the Earth. Other sections include the atmosphere, biosphere, hydrosphere, climates, and ecosystems. http://www.geography4kids.com/files/earth_intro.html
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					 			      	Interactives, Dynamic Earth, Earth's Structure - Learner
					 			      	 
 In the early part of the 20th century, geologists studied the vibrations (seismic waves) generated by earthquakes to learn more about the structure of the earth's interior. They discovered that it is made up of these distinct layers: the crust, the mantle, and the core. http://www.learner.org/interactives/dynamicearth/structure.html
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					 			      	Structure of the Earth - Wikipedia
					 			      	 
 The interior structure of the Earth is layered in spherical shells, like an onion. https://en.wikipedia.org/wiki/Structure_of_the_Earth