When it comes to snow flakes, you may have heard that no two snow flakes are alike. In nature that especially true. But how can that be when billions of flakes ...

In the same eruption, the lava lakes cooled slowly and evenly, forming regular columns of basalt. Sound familiar? The hexagonal columns are what we now call now the Giant’s Causeway, a UNESCO ...

Lower Carboniferous, USA, Europe, China, ?Former Soviet Union. The wide adradial bands of pore-pairs, piercing small hexagonal columns of plates distinguishes this taxon from other Palaechinidae.