Can you please help me for questions 5 to 10? Concept Quiz: Igneous Rocks Name:
ID: 295603 • Letter: C
Question
Can you please help me for questions 5 to 10?
Concept Quiz: Igneous Rocks Name: Lab Section: Score: Questions OI through 10: For each of the following statements indicate the fgure that best fits feither A or B. Ifhoth figures fit the statentent than mark C: Combined. If neither figure uppiies to tihe statement than mark: D: Doesn't apply. (Note: Figure B hes a uery dark fine-grained grourdmass.) Figure A Figure B Fine-grained Groundmass K-Feldspar Quartz PyroHene Phenocrysts 01. Found in the Sierra Nevada batholith. 02. Formed deep within the crust of the earth. 03. Formed at the earth's surface. 04. Of these two samples one most likely formed from magma generated at a subduction zone (Hint that means one of the samples must be "most likely") 05. Formed by slow cooling of magma. 06. Formed from magma generated at a divergent margin, without any assimilation or differentiation (fractional crystallization). 07. Could have formed from a magma generated by partial (fractional) melting of the asthenoshpere 08. Could have formed from a melt that has undergone either differentiation (fractional crystallization). or assimilation or both. 09. Formed from cooling lava flows on the side of a shield volcano. 10. Formed directly from the eruption of material from a composite volcano.Explanation / Answer
1. Answer is Option A. Sierra Nevada batholith is made up of granite. Granite consits of quartz and alkali feldspar. The first cross section depicts granite.
2. Granite forms most of the continents. It is also formed at high depth. The first cross section indicating granite is thus the correct answer. Its option A.
3. Option D. A volcanic rock that forms at the earth surface consists of fine grains that are so small that they are not visible to us. Here neither of the cross section depicts so.
4. Rocks formed at the subduction zone shows porphyritic texture,where phenocryst or the large grains are surrounded by the fine grained groundmass, which is depicted by the second cross section. So the answer is option B.