Igneous_Rocks_Regents_Practice_SC

A) non-crystalline and vesicular B) coarse and non-vesicular C) elastic and fragmental D) foliated and banded 1. The photograph below shows a magnified view of a portion of a rock that can float if placed in water. Which terms best describe this rock? A) weathering and erosion B) compaction and cementation C) heat and pressure D) melting and solidification 2. Which processes lead directly to the formation of igneous rock? A) glassy B) vesicular C) fine grained D) coarse grained 3. Which texture best describes an igneous rock that formed deep underground? A) slowly, deep below Earth's surface B) slowly, on Earth's surface C) quickly, deep below Earth's surface D) quickly, on Earth's surface 4. Obsidian's glassy texture indicates that it formed A) obsidian B) rhyolite C) gabbro D) scoria 5. Which igneous rock is dark colored, cooled rapidly on Earth's surface, and is composed mainly of plagioclase feldspar, olivine, and pyroxene? A) andesite B) pegmatite C) pumice D) scoria 6. Which igneous rock has a vesicular texture and contains the minerals potassium feldspar and quartz? A) lava that cooled slowly on Earth's surface B) lava that cooled quickly on Earth's surface C) silt that settled slowly in ocean water D) silt that settled quickly in ocean water 7. What is the origin of fine-grained igneous rock? A) amphibole, calcite, and hematite B) amphibole, biotite mica, and gypsum C) plagioclase feldspar, pyroxene, and olivine D) plagioclase feldspar, potassium feldspar, and quartz 8. Which three minerals are most commonly found in the igneous rock granite? Name: _____________________________________________________ Date: _______________ WKST # Igneous Rocks Regents Practice

A) B) C) D) 9. Which graph best represents the relative densities of three different types of igneous rock? A) granite B) andesite C) peridotite D) scoria 10. A fine-grained igneous rock composed mostly of plagioclase feldspar and hornblende and containing no quartz or pyroxene would be classified as

A) B) C) D) 14. The graph below shows the relationship between the cooling time of magma and the size of the crystals produced. Which graph correctly shows the relative positions of the igneous rocks granite, rhyolite, and pumice? A) B) C) D) 15. The diagrams below show the crystals of four different rocks viewed through the same hand lens. Which crystals most likely formed from molten material that cooled and solidified most rapidly? A) rhyolite and diorite B) pumice and scoria C) peridotite and andesite D) gabbro and basalt 16. Which two igneous rocks could have the same mineral composition?

A) a high concentration of silicon and a low concentration of iron B) a high concentration of iron and a low concentration of aluminum C) a high concentration of aluminum and a low concentration of iron D) a high concentration of aluminum and a low concentration of magnesium 17. Which relative concentration of elements is found in a mafic rock? A) fine-grained and mafic B) fine-grained and felsic C) coarse-grained and mafic D) coarse-grained and felsic 18. Which is the best description of the properties of basalt? A) quartz and plagioclase feldspar B) potassium feldspar (orthoclase) and quartz C) plagioclase feldspar and potassium feldspar (orthoclase) D) biotite mica and hornblende amphibole 19. Which minerals are present in granite but are never present in gabbro? A) " " B) " " C) " " D) " " 20. "Which granite sample most likely formed from magma that cooled and solidified at the slowest rate?" Transfer ALL answers to these bubbles