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Igneous and metamorphic rocks

Rock Did you know what this rock was?

It is an igenous rock called basalt. Basalt is a dark rock formed from the lava that erupts from some types of volcano.

This sample looks a bit like Swiss cheese - it has a lot of holes in it. Molten rock often contains dissolved gases - these gases bubble out of the lava when it is still a liquid, but as the lava solidifies, the gas becomes trapped. It is this gas that forms the bubbles you see here.

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