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Ch04clickerquestions - 04.01 Lava flows are typically finer...

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1. Intrusive magma is cooler because it is well insulated by the surrounding rock. 2. Intrusive magma flows onto the Earth's surface and cools very slowly, allowing many small mineral grains to grow. 3. The extrusive magma cools quickly so the mineral grains do not have time to grow. 4. The extrusive magma, because it is deep below the surface, cools very slowly producing very small mineral grains. 04.01 Lava flows are typically finer grained than intrusive igneous rocks. Why?
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1. Basalt dike; fills a vertical fracture at shallow depth. 2. Pumice lump; crystallized at depth in a mass of intrusive granite. 3. Peridotite; crystallized at depth in the upper mantle. 4. Pegmatite; crystallized from a water-rich, highly differentiated, residual magma. 04.02 In which of the following igneous rocks and environments would you expect to find unusually high concentrations of rare elements such as lithium, beryllium, and boron?
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Magma is any partially or completely melted rock; lava is magma that reaches the surface of the earth.
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Ch04clickerquestions - 04.01 Lava flows are typically finer...

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