ed than intrusive igneous rocks. Why? A) Intrusive magma is cooler because it is

Question

ed than intrusive igneous rocks. Why? A) Intrusive magma is cooler because it is well insulated by the surrounding rock. B) Intrusive magma flows onto the Earth's surface and cools grow. C) Th D) The extrusive magma, because it is deep below the surface, cools very slowly producing small mineral grains very slowly, allowing many small mineral grains to e extrusive magma cools quickly so the mineral grains do not have time to grow. 60) New oceanic crust and lithosphere are formed at B) Convergent boundaries by submarine eruptions and intrusions of rhyolitic magma C) Divergent boundaries by submarine eruptions and intrusions of basaltic magma D) Convergent boundaries by submarine eruptions and intrusions of basaltic magma

Explanation / Answer

59. The lava flows are typically finer grained that intrusive rocls because the extrusive magma (lava flows) cools quickly so the mineral grains do not have time to grow. When an extrusive lava flows over the Earth's surface, the atmosphere temperature will quickly cool the magma. Intrusive magma will be beneath the surface hence it will take time to cool allowing many crystals to accumulate.

60. New Oceanic crust and lithosphere are formed at Divergent boundaries by submarine eruptions and intrusions of basaltic magma. The oceanic crust is made up of basalt and is formed at Mid oceanic ridges which are basically divergent boundaries

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