ZME Science on MSN4 个月
What are thundereggs? The rare, chalcedony-filled rocks
those with rhyolite lavas. They look a bit like geodes, but they’re not exactly geodes. There are three types of rock: ...
BBC1 年
The UK rocks - in many ways. But do you know the rocks it's made of?
The town walls of Conwy in North Wales are the perfect place to spot a rock called rhyolite. An igneous rock, it is formed from an explosive type of lava. It can be best seen in the upper sections ...