earths structure

Download Earths structure

Post on 16-May-2015




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2. A short video Clip AGY1dmE&feature=related 3. How do we know what it looks like? Geologist record the seismic waves that earthquakes make and study how they travel through Earth. The speed of these seismic waves andthe path they take reveals how the planet is put together. 4. Temperature increases as you descend Pressure (force pushing on a surface area)-the deeper you go the greater the pressure. 5. 1. Crusts Layer of rock that forms Earths outer skin Includes both the dry land(continental) and ocean floor (oceanic)Extra: Oceanic is DENSER so it sits BELOW the continental 6. densitythe amount of mass in a given space 7. The deepest hole ever drilled into thecontinental crust was in the Kola Peninsula, in Russia. It was 12,226 meters deep! Because the temperature of the crustincreases with depth, it is impossible to drill much deeper into the crust. 8. 2. Mantle A layer of hot rock The uppermost part of the mantle and thecrust together form a rigid layer called the lithosphere Temperature and pressure in the mantle increase with depth Layer beneath the lithosphere that is less rigid then the rock above it is the asthenosphere. The material in this layer can flow slowlyExtra: Sometimes its called the 9. 3. The core Metal iron and nickel make up both parts of the core Outer core is a layer of molten metal that surrounds the inner core (LIQUID) Inner core is a dense ball of SOLID metal, where extreme pressure squeezes the atoms of iron and nickel so much that they cannot spread out and become a liquid. 10. Currents in the liquid outer core forcethe solid inner core to spin at a slightly faster rate than the rest of the planet. These currents in the outer core alsocreate Earths magnetic field, which causes the planet to act like a giant bar magnet. 11. 1.What are the four main layers of the Earth?2.What is the difference between the oceanic and continental crust?3.Whats the difference between the inner and outer core?