Q: How have the basalts of the Giant's Causeway in Ireland and the Isle of Staffa in Scotland helped geologists piece together the geologic history of the area?

Flexi Says: Giant's Causeway is composed of more than 40,000 basalt columns. The columns are mostly hexagonal, although they have between four and eight sides. On Scotland, across the Irish Sea, is the other side of the same basalt flows. Geologists describe the origin of Giant's Causeway as being the result of slowly cooling lava from an ancient volcanic eruption.