The Plate Tectonics Revolution: Crash Course Geography #19
The Plate Tectonics Revolution: Crash Course Geography #19
CrashCourse · YouTube
Key points
By the end of the lesson the learner can describe earth movements and the continental drift and plate tectonic theories.
By the end of the lesson the learner can explain how faulting forms features such as the Rift Valley.
By the end of the lesson the learner can state the significance of faulting to human activities.
Audio narration — reads aloud, works offline
Transcript
[0:00] Forces deep inside the earth slowly reshape its surface through movements we call internal land-forming processes.
[0:40] The continental drift theory says the continents once formed a single mass and have since drifted apart.
[1:20] The plate tectonic theory explains this drift: the earth's crust is broken into huge plates that move.
[2:05] When the crust cracks and blocks shift up or down, we call it faulting, which can form valleys and escarpments.
[2:45] Kenya's Great Rift Valley formed through faulting and gives us lakes, fertile soils and geothermal energy.
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