Lecture 5 lithosphere & Biosphere_ASR.ppt

Lecture 5 lithosphere & Biosphere_ASR.ppt - Lecture-5...

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Lecture-5: Spheres of the Earth Lithosphere & Biosphere Course Instructor: Md Asif Rahman (ASR) Lecturer, Department of Mathematics and Natural Sciences (MNS) University Building 2 (15 th Floor) E-mail: [email protected]
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Figure: Earth’s internal zones.
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Earth’s internal zones: Core Inner core Outer core Mantle Upper mantle Lower mantle Crust Oceanic crust Continental crust Earth’s Structure
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Core 1. The inner most part of the earth 2. Temperature of the centre of the core is between 4000 0 C to 5000 0 C. 3. This part is composed of iron, nickel & cobalt & known as Nife. 4. Density is very high It has two layers a liquid exterior-outer core- 2250 km (thickness)-made of liquid Fe, Ni a solid interior-inner core-1200 km (thickness)-made of solid Fe, Ni Mantle 1. layer between the core & the crust 2. 2900 km 3. Consists of a thick layer of molten ( গললত ) rock 4. contains over 80% of the Earth’s volume Composed of two parts upper mantle lower mantle
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Lithosphere:
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