Lava rock, or volcanic rock, is made from the molten lava that volcanoes emit. Available in red or black, it tends to weigh less than many other landscaping stones. Thanks to its porosity ...

Join Isla and Connor as they explore igneous rock landscape features at Traprain ... ISLA: Yes, because it’s a volcanic plug. A plug forms when molten lava and hot ash gets stuck as an upright ...

Generally of volcanic ... the surrounding landscape, meanwhile, “points to recurrent attentive collection for a purpose,” she continues. Exactly what function the balls of rock served is ...