Journey to the Earth's Layers
The Earth's structure consists of four main layers: the crust, mantle, outer core, and inner core. The crust is the thin, rocky layer we see on the surface, while the mantle is a solid layer that flows like a viscous liquid. The outer core is a hot, melted layer of iron and nickel, and the inner core is a solid ball of iron and nickel at the Earth's center. Volcanoes and earthquakes are natural phenomena caused by movements within these layers.
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Presentation Transcript
Crust This is the thin, rocky layer we think of as Earth s surface. Its thickness changes from about 50 miles to 3 miles.
Mantle This layer is rock hard, but it actually flows around the outer core, moving about as fast as your fingernails grow. http://www.youtube.com/watch?v=uMcNCbR7B40 1:08-2:12
Outer Core This layer is also made up of mostly iron and nickel, but here the metals are melted into very hot liquid. This hot liquid forms a layer that moves around the inner core.
Inner Core The center of the Earth is about 6,000 miles below the Earth s surface. It is a solid ball made of mostly 2 materials: Iron and Nickel. If we had a gallon jug of the earths core material, it would weigh more than 100 pounds!
Volcanoes and Earthquakes Gyser/ Volcano http://www.youtube.com/watch?v=uMcNCbR7B40 3:15- 3:50 Earthquake: when the surface of the earth that is floating on the mantle shifts from heat build up.
