Igneous Rocks
Igneous rocks are formed by cooling and solidification of originally molten material. Examples of igneous rocks include the basalt lava of the Antrim Hills and Giant's Causeway, and the granite which forms the Mourne Mountains.
Pictured left: Basalt columns, formed by cooling and shrinkage of molten lava. Giant's Causeway, Co. Antrim.
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Pictured right: The Mountains of Mourne, a huge mass of granite towering above the lowlands.
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