Igneous Rock Mineral Size onrod Basat ong th the ro How How Check your answer wi
ID: 287228 • Letter: I
Question
Igneous Rock Mineral Size onrod Basat ong th the ro How How Check your answer with your answers for Questions 5 and 6 Part 3: Porphyry 8. The igneous rock to the right has large, black-and white colored minerols and many small, gray minerals. You can tell it is an igneous rock because the minerals are rectangular and not rounded like sediments. How might the igneous rock shown to the right have formedi? C big m Porphyry 9·Two students are debating about the cooling rate of this rock, and the formation of the large minerals Student 1: The mogma must have gotten large pieces of sediments that we con see trapped in it, and the sediments didn't melf, even though they were in the mogma. So, this rock formed becouse lorge pieces of sediment got picked up by lava, and then that lava cooled quickly Student 2: This is an igneous rock, so everything storted off as magma. The lorge minerals must have formed deep underground when the magma was cooling slowly, like in a magmo chomber. But the rest of the rock has very small minerals so they cooled quickly ot the surface. With which of these students do you ogree? Why? 10. Student 2 soid that the lorge minerols formed deep underground, like in a mogma chamber, and the smali minerals formed at the surfoce. Describe what actually happened to form the rock. In other words, what story does the appearance of this rock tell us about its history? (Hint: In what situation is magma in o magma chamber moved to the surface?) ©W. H. Freeman and Company Lecture Tutoriols for Earth Science 50Explanation / Answer
Q6) answers: basalt and gabbro
explanation: The rocks of acidic composition has low density and existed at the upper part of the crust. The mafic rocks such as basalt and gabbro are existed at deeper of the cruscrust because of their high density.