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🌍 Is Africa really splitting in two?

Yes — at a few millimetres a year, unevenly, and mostly without shaking. In September 2005 a 60 km stretch of Afar opened by eight metres, and earthquakes accounted for only about 8% of it. Follow the fault blocks, the GPS arrows and the la

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

A Valley Made by StretchingRecognize how extension and normal faulting build rift valleys, and why the rift branches.The visible valley is the surface expression of a broad, uneven plate-boundary process.
Where Plates Begin to SeparateExplain why Afar, uneven volcanism and dike intrusion reveal different stages of continental breakup.Thinning crust, magma and a three-way junction make the northern rift unusually revealing — and much of the opening happens without shaking.
Lakes, Quakes, and Living BasinsConnect rifting to lake basins, earthquake patterns, habitats and human environments.Lowered basins and active faults create archives and living landscapes, not just dramatic scenery.
The Continent's Possible FutureWeigh multiple lines of evidence to judge what the rift's long-term future can and cannot tell us.A new ocean is a geological possibility measured in millions of years, supported by clues that are only strong together.

Questions this course answers

What makes the Great Rift Valley a rift system rather than one simple crack?

The Eastern and Western branches wrap around the Victoria basin and differ in age, speed and volcanism.

What does a normal fault do in stretching crust?

Extension makes room and gravity fills it, dropping blocks to form grabens and half-grabens.

In the 2005 Dabbahu episode, roughly how much of the measured opening did earthquakes account for?

The segment opened by up to 8 m, but seismic rupture explained only about 8% of the deformation seen from orbit.

Why are rift lakes useful geological evidence?

Lakes such as Turkana and Tanganyika sit in fault-bounded basins whose sediments record the basin's history.

What is the careful version of 'Africa is tearing in half'?

Breakup is a possible long-term outcome, and rifts can also slow, jump, branch or fail before an ocean forms.

Grounded in trusted sources

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