Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast ...

What was left of the man’s brain had changed into fragments of shiny black glass ... in a rock material called silica. When it cools down rapidly, it forms obsidian. This is a natural volcanic ...

Photo by Todd Kristensen Volcanic glass has been discovered at more than 500 archaeological sites in western Canada.

Lava flows are masses of magma that pour onto the Earth's surface during an eruption; they include both moving lava and the resulting solidified deposits of black ... of volcanic rock and lava ...

Volcanoes inspire awe with spectacular eruptions and incandescent rivers of lava, but often their deadliest hazard is what ...

“We never expected to find delicate tissues such as feathers preserved in a volcanic rock.” Using electron microscopes and chemical tests, the researchers analysed samples of the fossil ...

"Zeoloites can form as primary minerals (with pretty crystals) or can form secondarily, during the natural alteration of volcanic glass and ash, giving the rock a 'mudrock-like' aspect." ...

Jeju Island, a stunning jewel off the southern coast of South Korea, is a destination that offers a perfect blend of natural beauty, unique culture, and rich history. With its lush landscapes, ...

Photo by Todd Kristensen Volcanic glass has been discovered at more than 500 archaeological sites in western Canada. Geologically-speaking, it shouldn’t be there. Now, researchers may have ...

during the natural alteration of volcanic glass and ash, giving the rock a "mudrock-like" aspect." The alteration of the ash due to passage of water induced the precipitation of zeolites ...