The hidden physics of the ground beneath us.
Why continents drift, why America's cities are sinking, why rivers try to escape. Short videos that work out the answer with you, and every number checked against its source.
Newest video
Why America Won't Let the Mississippi River Move
Why won't America let its biggest river take the shortcut it wants?
Watch on YouTubeStart here
New to Grasp Geo? Watch these three in order. Each one builds on the last.
Pangaea Explained
How the continents were once one, and how we know.
Why the Ring of Fire Never Stops Shaking
Where those moving plates collide today.
Why America's Biggest Cities Are All Sinking
The ground moving under all of us, right now.
Every video, by series
Each one is built around a hard question, and answers it step by step.
Earth Through Time
How the planet built the world we live on.
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Pangaea Explained: When All the Continents Were One
If the evidence was so clear, why was it rejected for fifty years?
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Why the Ring of Fire Never Stops Shaking
Why do the biggest earthquakes strike around the Pacific?
Sinking Cities
Why the ground under America's cities is moving.
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Why America's Biggest Cities Are All Sinking
Why are cities far from any coast sinking too?
Why Houston Is America's Fastest-Sinking City
If the water is still underground, why does the ground sink?
America's Lifelines
The rivers, aquifers and canals America quietly depends on.
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Why America Won't Let the Mississippi River Move
Why won't America let its biggest river take the shortcut it wants?
Coming soon to YouTube
Read the full story now. Subscribe so you don't miss the video.
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Why San Francisco Is Sinking Into Its Own Bay
Why did a brand-new skyscraper sink three times more than predicted?
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Why America's Deadliest Floods Come Out of Nowhere
Why can a foot of moving water carry away a car?