CHAPTERS (click blue links to go to that time code in video. 0:00 Introduction 0:36 1600s–1800s 1:11 Bathymetry reveals ridges 1:30 Wegner’s Continental Drift 2:11 Radioactive decay 2:50 Nuclear bomb testing 3:13 Marie Tharpe/ocean ridges 3:46 Harry Hess/seafloor spreading 4:02 Seafloor magnetic stripes 4:17 Hot-spot formation 4:35 Three Boundary types 4:52 Mantle convection/gravity The theory […]
Tag: plate tectonics
What's Actually Inside the Earth's Core? | Journey to the Center of the Earth
Have you ever wondered how we *really* know what’s at the center of the Earth? Thanks to some amazing scientific insights, we know a lot about the interior of our planet – even though we’ve never even made it through the crust. Join Hank Green for a new geological episode of SciShow! Support SciShow by […]
The Plate Tectonics Revolution: Crash Course Geography #19
Today we’re going to tell the story of a quiet revolution in the 1960s that shifted our entire understanding of how the Earth works. We currently believe that the Earth’s broken outer shell rises from the mantle and folds back in – kind of like a dance of creative destruction and reconstruction – giving us […]