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S4C

Twt - Cyfres 1: Yr Helbul Gwyrdd

Mae dwr yr harbwr wedi troi'n wyrdd dros nos. Tybed beth yw e a sut y gwnaiff yr Harbwr Feistr cael gwared ohono? The harbour water has turned green overnight. What is causing t...听

Duration11 mins
First shown13 Mar 2016
Available for 18 days

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