Скачать или смотреть Inside our earth || CBSE CLASS 7 GEOGRAPHY Chapter 2, NCERT

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This time we are here with the Inside our Topic of Class 7 Geography subject.

Important Links for previous chapters
Chapter 1 : Environment :    • Environment chapter 1 Geography CBSE in hi...  
Chapter 2 : Inside our earth:    • Inside our earth || CBSE CLASS 7 GEOGRAPHY...  
Chapter 3 : Our Changing Earth Part 1 :    • Our changing earth chapter 3 Geography CBS...  
Chapter 3 : Our changing Earth Part 2 :    • Our Changing Earth chapter 3 Geography CBS...  
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Inside earth
Earth Interior
Crust
Rocks and minerals
Rock formation
Mantle
About 2900 km thick
85% by volume
64% by mass
Made of iron but mainly silicates
Asthenosphere – Upper mantle – Convection currents
Viscous, weak and ductile
Just below lithosphere
Main source of Magma
B/w Upper & lower mantle – Repetti Discontinuity
B/w Mantle & Core – Guttenberg Discontinuity
Core
Radius of about 3500 km
Made of Iron & Nickel (NIFE)
High temperature & pressure
15% of earth’s volume
32.5% of earth’s mass
Outer Core – Liquid (Slow Moving – Produces Earth’s Magnetic Field)
Pressure, Density increases towards center
Rocks
Earth’s Crust
Natural mass of matter that makes the crust
Differ in Size, Color & Texture
3 Types of Rocks
Igneous
Sedimentary
Metamorphic
Igneous Rocks
Molten Magma Cools & Solidifies
Also known as Primary Rocks
Two Types
Intrusive – Cools inside, Slowly cools, Forms Large grains - Granite
Extrusive – Comes on Surface – Basalt (Deccan Plateau) – Fine Grained

Sedimentary Rocks
Rocks roll, crack & hit to break
Sediments are transported
Then compressed & hardened
Sandstone – made from sand
Red Fort – red sandstone
Include fossils
Metamorphic Rocks
Igneous & Metamorphic change under heat & pressure
Clay → Slate
Limestone → Marble
Taj Mahal – White Marble
Rock Cycle – Transformation
Minerals
Naturally occurring substances
Have certain physical properties
Definite chemical composition
Fuels – Coal, Petroleum & Natural Gas
Industries – Iron, Aluminum
Medicines – Calcium, Phosphorus, Magnesium