Check your oil Part 3: Porphyry 8. The igneous rock to the right has large, blac

Question

Check your oil Part 3: Porphyry 8. The igneous rock to the right has large, black-and. minerals. You can tell it is an igneous rock becouse the white colored minerals and many small, gray minerals are rectangular and not rounded like might the igneous rock shown to sediments. How the right have formed Porphyry 9. Two students are debating about the cooling rate of this rock, and the formoation of the large minerals Student 1: The mogma must have gotten large pieces of sediments that we see trapped in it, and the sediments didn't melt, even though t hey were in the magma. So, this rock formed because large pieces of sediment got picked u lava, and then that lava cooled quickly Student 2: This is an igneous rock, so everything started off as mo minerals must have formed deep underground when the magma wo slowly, like in a magma chamber. But the rest of the gma. The large s cooling rock has very small minerals, so they cooled quickly at the surface. With which of these students do you agree? Why? Student 2 said that the large minerals formed deep underground, like in a magma chamber and the small minerals formed at the surface. Describe what actually happened to form the rock. In other words, what story does the appearance of this rock tell us about its history? int: In what situation is magma in a magma chamber moved to the surface?)

Explanation / Answer

8. As the given image is containing a wide variety of minerals with large black and white colored minerals and small gray minerals and all these minerals grains would have developed by the cooling of the magma i.e., from molten rock material originated within the deep inside the earth.

9. I agree with the second student because his justification explains well in the origin of the rock, whereas for the student 1 suggests that magma has undergone with certain adulteration of the foreign sediments, this can only be supported by the presence of the reaction rim on the larger minerals which have to fall in the magma, but this is missing with the larger minerals grains, so, Student, 2 points are well supported by the given rock sample.

10. When the magma was ascending from the magma chamber it experience in lowering of the temperature along with the reduction of the pressure this results in the development of the early minerals to grow and crystallize and they were well supplied with the nutrients to grow the crystals into the larger size as compare to the smaller crystals, when this semi-solidified magma reached the surface it cooled down rapidly to crystallize the other crystals which are smaller in size, resulting in the development of the numerous smaller sized minerals to came in existence.

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