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Transcript
Earth’s Layers Presented by Kesler Science Essential Questions: 1. What are the main characteristics of the Earth’s layers? 2. How can the Earth’s layers be illustrated? Quick Action – INB Template Earth's Layers INB Template 1. Cut out the four INB templates to form a flip book. 2. This is page 4 and should be completely pasted into your notebook. 3. The following 3 pages will attach only at the top. © KeslerScience.com Quick Action – INB Template Page 3 © KeslerScience.com Page 2 Page 1 Earth's Layers Crust • The outer layer of the earth • Similar to the skin on an apple (thinnest layer) • Made up of both continental (land)and oceanic crust(under the ocean). • 5-50 km thick © KeslerScience.com Earth's Layers Lithosphere • Solid outer section of the Earth, which includes the crust (rocky layer) • Also, includes the cool, dense, rigid upper part of the mantle © KeslerScience.com Earth's Layers Asthenosphere • Solid part of the upper mantle • Weaker, less rigid (plasticity - like silly putty) • Crust moves over the plastic-like asthenosphere • These plates crash into each other. • Here the oceanic crust is subducting under the continental crust which creates volcanoes. © KeslerScience.com Quick Action – Earth's Layers Draw and label a picture of the Earth’s lithosphere and asthenosphere in your INB’s. Lithosphere Asthenosphere © KeslerScience.com Earth's Layers Mantle • Largest layer of the Earth • Under the crust about 2,890km • Composed of silicate rocks rich in magnesium and iron • Intense heat causes the rocks to rise and then cool and sink. • The process is called convection, which causes the crust to move. • Average temperature 3000o © KeslerScience.com Earth's Layers Outer Core • Liquid layer (magma) 2,300 km thick, second largest • Composed of liquid iron and nickel • Lies between inner core and mantle • Because the magma moves around the inner core, Earth’s magnetic field is created. • Average temperature 4000o -5000o © KeslerScience.com Earth's Layers Inner Core • A solid ball of metal • 1,250 km thick • Made of solid nickel and iron • So hot it melts everything in the outer core • Spins at a speed faster than the Earth rotates • Densest layer of the Earth • Average temperature 5000o 6000o © KeslerScience.com Quick Action – Earth's Layers Take a break. Get up and dance https://goo.gl/aDFsvz © KeslerScience.com Earth's Layers What are seismic waves? • Waves of energy caused by earthquakes and other rock movement • Travel through some layers of the Earth • Recorded with seismographs © KeslerScience.com Earth's Layers • Seismic waves are used to determine which layers of the Earth are solid or liquid. • Some seismic waves cannot pass through certain layers giving us a clue to the layers composition. © KeslerScience.com Check for Understanding Can you… 1. List the characteristists of each of the Earth’s layers? 2. Illustrate the Earth’s layers? © KeslerScience.com
