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Our Changing Earth
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This lesson deals with two most important theories - Continental Drift Theory and Theory of plate tectonics.It also has detailed sections on volcanoes and earthquakes.

Arpita Prakash
NCERTs series initiator at Unacademy 'Educator of the Month' for Feb'19 CBSE 0.1% Merit Certificate holder in Mathematics

U
Unacademy user
Right to vote is a legal right not a fundamental right under Part III of the Indian Constitution.
this lesson is awesome but in book there is topic of work of ice work of river and work of wind which you not tell
Arpita Prakash
2 years ago
I would suggest you to check other lesson for the same !
Priya Kotwal
2 years ago
why did u separate lessons
Priya Kotwal
2 years ago
mammmm
Arpita Prakash
2 years ago
The unacademy app is built in that way...moreover if you get all the required and relevant contents on the platform, I would suggest you to focus more on that and less on the other not so relevant stuffs. Hope that helps !
R
Rashi
9 months ago
thank you so much for putting a lots of efforts in consolidating everything. These lessons are helping a lot to the freshers like me. keep going.
K
thank you so much ma'am very nice lessons
Mam your courses are very well designed. the methodology you employ while teaching is unique and help us to understand the complex concepts quickly.
Arpita Prakash
3 years ago
Thanks :)
Dk
Divyanshu kumar
3 years ago
mam how will i download class 8 and 9 videoes
Nitin Sharma
3 years ago
Arpita Mam.... Please provide course for NCERT Geography Class 10 & 12 Are ur courses enough for UPSC CAPF (AC) 2017 -----> 23rd July,2017 or should have to study NCERT `s briefly along side.....?? Have really less time left now......Though u have complied it up all in ur courses..... I have also covered Mrunal`s Geography Videos....
Richter scale - magnitude, Mercalli scale - intensity......Am I correct mam???
yes Richter scale records the magnitude of an earthquake while Mercalli scale measures how people feel and react (intensity) to the earthquake
Anusha Tellakula
3 years ago
Yes, seismograph records the waves but not intensity
Nishu Singhal
2 years ago
yes right...
thank u so much mam ....i just love your lessons
  1. COURSE: NCERT SUMMARY GEOGRAPHY CLASS VII PRESENTED BY ARPITA PRAKASH


  2. ABOUT ME: . ARPITA PRAKASH B.A HONS HISTORY FROM IP COLLEGE,DU B.ED FROM JAMIA MILLIA ISLAMIA . M.A HISTORY FROM IGNOU CREATIVE ART WORKS, READING AND TEACHING RATE, REVIEW AND RECOMMEND AND SHARE ollow meat https://unacademy.com/user/arpitaprakashz


  3. LESSON OUR CHANGING EARTH CAN SOUTH PLATE AMERICAN LATS ANTARCTIC


  4. OUR CHANGING EARTH La gist salu tha all th continents Call eare) au uatasu)


  5. 29-0 Pangaea (supeu-continent. ) rvul a componant) cninints dhat avist taday


  6. CONTINENTAL DRIFT OF PLATES Laurasia quator Equator Ondwana 225 Million Years Ago 150 Million Years Ago North America North America Eufope Asia Asia Europe Africa India Equator Equator South Africa South America America Australia India Australia Antarctica Antarctica 100 Million Years Ago Earth Today Encyclopaedia Britannica, Inc.


  7. THEORY OF PLATE ECTONICS 1961 by McKenzie and Pasukeu and Masegan hithaup here broken into munnhou o suoak plates Continent a ocamie plate plata each uea at mattan magma imside zastih)


  8. North 0 American late Eurasian plate Juon de plate Philippine plate plole Pacific Cocos Pacific plate plale plate piate African plate South Nazca American plate plate Australian-Indian plate Scotia plate Antarctic plate


  9. on the to Endag me cas Eno lmsida) Exo Laustsida) Genic Casigin) act w R slaw as wau as guddam


  10. VOLCANOES in the Eauths eust ash gas


  11. Plate boundary Seismic waves radiate out in all directions Epicentre Focus this is where the earthquake occurs. It is the origin of the seismic energy Fig. 3.3: Origin of an Earthquake


  12. Wanes Wams CS-usane) frit salid motesials tiquid and salid