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Chapter 2 Inside Our Earth
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Chapter 2 Inside Our Earth

Dr Swasti Sinha
Dental Surgeon | Learner | Educator | Bibliophile | Ambivert

U
Unacademy user
Vp
Mantle covers Max. part and you mentioned only 16% where as core 83% ?????
how come the radius of Earth is 6378km n only inner crust is above 5000km n writing about core u have mentioned it's radius 3500km please elaborate also is mantle width either 2900 or 2500km?
how come the radius of Earth is 6378km n only inner crust is above 5000km n writing about core u have mentioned it's radius 3500km please elaborate also is mantle width either 2900 or 2500km?
how come the radius of Earth is 6378km n only inner crust is above 5000km n writing about core u have mentioned it's radius 3500km please elaborate also is mantle width either 2900 or 2500km?
Dr Swasti Sinha
a year ago
Hie Sakshi Keshav..my sincere apologies to you guys. There is a little mistake in the facts and figures I mentioned regarding the depth from crust to center of the earth. As you can see in the diagram starting from the crust if we go downwards towards the center of the earth ..then first we have the topmost layer the crust which is 0-100km thick..further we go down till the level of mantle then we are at a depth of 2900km from the surface of earth..Then we further move down we are at a depth of 5100km..this the layer junction between outer core and inner core..then we move down further and we reach the center of the earth that is 6378km..we don't have to add the depth here... I hope my explanation is useful to you...thanks for asking this question.. If any further doubt you can ask here.
how we find the radius of earth
  1. CHAPTER-2 INSIDE OUR EARTH PRESENTED BY Dr. SWASTI SINHA


  2. ABOUT MYSELF . Dr. Swasti Sinha . B.D.S. ESIC Dental College Delhi . Avid reader . Art and Craft Enthusiast . Unacademy Educator since 2017


  3. Crust Mantle Outer Core Inner Core


  4. Lithosphere (crust and upper- most solid mantle) Crust 0-100 km thick Asthenosphere Mantle Crust Mantle 2900 km Liquid Outer core Core 5100 km Inner core Solid Not to scale 6378 km To scale


  5. CRUST Uppermost layer * Thinnest 35km on the continents and only 5km on ocean floors . Sial-> main minerals on the continental crust . Sima-> main minerals on the oceanic crust


  6. MANTLE Depth of 2900 km below crust


  7. CORE Radius of 3500km * Innermost layer Made of NiFe . Very high temperature and pressure Deepest mine is in South Africa (4km Deep)


  8. Continental Crust Sedimentary Deposits Oceanic Crust 10 km 100 km Lithosphere Plastic Asthenosphere 200 km Upper Mantle (down to 670 km)


  9. crust forms only 0.5% volume ofthe earth 16% consists of the mantle and 83% makes the core Radius of earth is 6371km


  10. ROCKS AND MINERALS ROCK-> Any natural mass of mineral matter that makes up the earth's crust is called a rock. Different types: 1. lgneous 2. Sedimentary 3. Metamorphic rocks


  11. IGNEOUS ROCKS . Formed by the solidification of molten magma Primary rocks . Two types> intrusive and extrusive. * Igneous-Latin word meaning fire.


  12. Extrusive lgneous Rock (Magma comes out as lava and cools on the surface) Intrus ive Igneous Rock (Magma cools off beneath the surface ) Earth's surface Magma


  13. METAMORPHIC ROCKS . Under great heat and pressure the igneous and sedimentary rocks change into metamorphic rocks, Example-clay changes into slate and limestone into marble.


  14. 3. Metamorphic Rocks Pressure vetomorhiG ROk 0


  15. USES OF ROCKS Hard rocks-> roads, houses, buildings Games like seven stones etc. . Red Fort is made up of Red Sandstone and Taj Mahal is made up of White Marble.


  16. THE ROCK CYCLE Sedimentary Rock Metamorphic Rock Changed by Hoat Pressure andlor Chemical Action Igneous Rock Magma Martie