Mafic igneous rocks - PowerPoint PPT Presentation

GCSE Geology

GCSE Geology. Igneous Rocks Introduction. Click anywhere on the screen to move on. Igneous Rocks. Definition of Igneous. Derived from the latin ‘ignis’ meaning fire Formed by the cooling, crystallization and solidification of molten lava or magma. Comprise an interlocking mosaic of crystals.

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Igneous Rocks – From Fire

Igneous Rocks – From Fire. Igneous rock forms when lava or magma cools and hardens to form crystals (crystallization). Two Major Groups of Igneous Rocks – Classified according to where the rock crystallizes. Intrusive Igneous Rocks – when the cooling of magma occurs deep below the crust.

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