GEOLOGY
PHYSICAL GEOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When the magma or lava is hot the pressure from earth’s surface creates crystals
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The particles inside the magma or lava dissolve and create crystals
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As the magma or lava cools down or hardens to a solid state it creates crystals
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None of the above
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Detailed explanation-1: -The magma, called lava when molten rock erupts on the surface, cools and solidifies almost instantly when it is exposed to the relatively cool temperature of the atmosphere. Quick cooling means that mineral crystals don’t have much time to grow, so these rocks have a very fine-grained or even glassy texture.
Detailed explanation-2: -Minerals from Hot Underground Water Magma heats nearby underground water, which reacts with the rocks around it to pick up dissolved particles. As the water flows through open spaces in the rock and cools, it deposits solid minerals.
Detailed explanation-3: -As a magma cools below 1300°C, minerals start to crystallize within it. If that magma is then involved in a volcanic eruption, the rest of the liquid will cool quickly to form a porphyritic texture.
Detailed explanation-4: -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-5: -If magma erupts to the surface and becomes lava, the lava will also cool quickly and form minerals with small crystals. dissolved in water leave a solution, crystallization occurs. Some minerals form when solutions evaporate.