the earth: a vibrant planet
DESCRIPTION
The Earth: A Vibrant Planet. Sorry to break it to you but the earth is NOT round – rather a spheroid. It bulges at the equator and flattens at the poles…. Structure of the Earth. Earth: From Core to Crust. THE STRUCTURE OF THE EARTH:. CRUST – earth’s exposed rock - PowerPoint PPT PresentationTRANSCRIPT
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The Earth: A Vibrant Planet
Sorry to break it to you but the earth is NOT round – rather a spheroid. It bulges at the equator and flattens at the poles…
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Structure of the Earth
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Earth: From Core to Crust
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CRUST – earth’s exposed rockMOHO the separation between the crust and the asthenosphereASTHENOSPHERE – Plastic like substance – responsible for movement of earth’s crust.MANTLE (MESOSPHERE) a semi-liquid plastic consistency which liquefies when pressure is reducedOUTER CORE liquidINNER CORE solid
THE STRUCTURE OF THE EARTH:
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Heating of the Earth causes convection currents in the Mantle
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This in turn causes stress on the surface of the earth…
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We know the structure of the earth due to the study of SEISMOLOGY (the study
of earthquake waves)
• the branch of geology that studies earthquakes•Primary (P) waves and Secondary (S) waves pass through the internal layers of the planet
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Primary Waves
• P waves stretch and squeeze; moving quickly, can pass through any material
• Travel by compression through solids, liquids, and gases
• Speed up through the mantle
• Drop at the outer core (liquid)
• Speed up at the inner core (solid)
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Secondary Waves• S waves vibrate passing only through
solids
• Slower than the P wave (60% of the speed)
• Will NOT travel through liquid
• Speeds up gradually through the mantle
• Then stops at outer core
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Waves in Action
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The use of “indirect evidence” serves to tell us the structure of the earth. Refraction and Shadow zones and arrival times are crucial
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Our Vibrant Earth
A Sombrio Production