Dr Kirstin (Kirsten) Lemon

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98 appearances 1 recordings 1 series first heard Jul 2026 last heard 10 Jul

Dr Kirstin (Kirsten) Lemon’s voice in public audio — every appearance, attributed to the second.

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Recordings per month over the last 12 months — 1 in all, peaking in Jul 2026 with 1.

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CrowdScience · What are these strange rocks? · 10 Jul 2026 podcast

But in Indonesia, we have got a process called subduction.

Whenever one plate is going beneath another, they produce very different types of basalt.

Now to the non-geologists, basalt is basalt.

But to geologists, they are very, very different depending on where you are.

So the basalt here, for example, has got a lot less of a mineral called olivine and the one in Indonesia has got a lot more olivine.

The one in Indonesia has also got a lot more water in it and because it's got a lot more water in it and it cools down a bit faster, it tends to not be as perfectly hexagonal as it is here.

So they do look regular to a degree, but they're a bit more jaggedy and it's got a slightly different chemical composition.

So whilst it is similar to here,

It's not exactly the same.

The most obvious example is Iceland.

They have got really good examples of basalt columns.

The Devil's Postpile in USA, it's not at the sea, but it's got the very, very similar rock types.

We do have similar formation to places like Korea and in Hong Kong, where the rock types are different, but the way they formed is the same.

It's still lava that has cooled really, really slowly.

So there are loads of places.

I think in every single continent on Earth, we have examples of this.

Absolutely are.

So anywhere where you hear there may be some kind of volcanic activity, you may get features like this.

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