Learn
Start with the big questions
Each lesson takes a few minutes, has drawings that move, and lists every source it uses. More are on the way.
- Structure · 7 minInside the EarthNobody has been below 12 km. Earthquake waves have been everywhere, and they tell us what is down there.
- Plate tectonics · 7 minMoving platesThe ground is broken into a dozen or so plates. The Atlantic gets 2.5 cm wider every year. Here is how we know.
- Hazards · 8 minEarthquakesRock bends for centuries, then snaps in seconds. And why a magnitude 7 is not a little bigger than a 6.
- Hazards · 7 minVolcanoesRunny magma pours. Sticky magma explodes. The difference is gas, and it decides who gets hurt.
- Deep time · 7 minHow old is the Earth?Atoms that fall apart at a steady rate are the clocks. Read them right and the answer is 4.54 billion years.
Two journeys
Surface to Core: fall 6,371 km to the centre at true scale. The Walk: 4.54 billion years at a metre per million years.