SOLAR SYSTEM

Detailed explanation-1: -Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust.

Detailed explanation-2: -Extrusive igneous rock, also known as volcanic rock, is formed by the cooling of molten magma on the earth’s surface. The magma, which is brought to the surface through fissures or volcanic eruptions, rapidly solidifies. Hence such rocks are fine-grained (aphanitic) or even glassy.

Detailed explanation-3: -Igneous rocks form by the cooling of magma (molten rock material beneath the surface) or lava (molten rock material extruded onto the surface).

Detailed explanation-4: -crystalline rock, any rock composed entirely of crystallized minerals without glassy matter. Intrusive igneous rocks-those that congeal at depth-are virtually always crystalline, whereas extrusive igneous rocks, or volcanic rocks, may be partly to entirely glassy.

Detailed explanation-5: -They are the most widespread of all the igneous rocks. Most basalts are volcanic in origin and were formed by the rapid cooling and hardening of the lava flows. Some basalts are intrusive having cooled inside the Earth’s interior.

Detailed explanation-6: -Porphyritic:a mixture of large and small crystals-perhaps a two-stage cooling history with the large crystals (the phenocrysts) cooling slowly and the small crystals (the groundmass) cooling more quickly.