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

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Welcome to our Youtube Channel NCERT. Solutions.
This is channel is specially created to help the students to understand the concept NCERT books.
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