Magma and lava cooling form different crystal sizes influencing igneous rock formation.
Magma is melted rock beneath Earth's surface, while lava is molten rock at Earth's surface. When magma cools slowly, mineral crystals have time to grow large, forming rocks. On the other hand, lava cools rapidly on the surface, resulting in small crystals known as fine-grained extrusive rocks.
Hot underground water heated by magma can deposit solid minerals, forming veins when minerals fill cracks or geodes when large crystals grow in open spaces. The cooling and crystallization of magma and lava play a crucial role in igneous rock formation, determining the size of mineral crystals.
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