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