5 Written Questions

1. rare, ultramafic rock that can contain diamonds and other minerals formed only under very high pressures
2. igneous rock composed of extremely large-grained minerals, often containing rare elements
3. process whereby some minerals melt at relatively low temperatures while other minerals remain solid
4. igneous rock that has holes in it like swiss cheese, made when gases become trapped in magma (as bubbles)
5. describes magma or igneous rock that is rich in feldspar and silica and that is generally light in color

5 Multiple Choice Questions

1. type of rock that forms when molten rock cools and minerals crystallize
   1. intrusive rocks
   2. basaltic rock
   3. igneous rock
   4. granitic rock
2. large, well-formed crystals surrounded by finer-grained crystals of the same mineral or different minerals; formed by slowly cooling magma that suddenly began cooling rapidly
   1. vesicular texture
   2. porphyritic texture
   3. texture
   4. granitic rock
3. rocks formed from the cooling a magma beneath the earth's surface
   1. intrusive rocks
   2. igneous rock
   3. extrusive rocks
   4. granitic rock
4. light colored, made from magma with high silica content, containing mostly quartz and feldspars
   1. intrusive rocks
   2. igneous rock
   3. granitic rock
   4. basaltic rock
5. describes magma or igneous rock that is rich in magnesium and iron and that is generall dark in color
   1. felsic
   2. mafic
   3. lava
   4. pegmatite

5 True/False Questions

1. fractional crystallization → process whereby some minerals melt at relatively low temperatures while other minerals remain solid

   True        False

2. lava → molten rock flowing onto Earth's surface

   True        False

3. texture → size, shape, and distribution of crystals or grains that make up a rock

   True        False

4. extrusive rocks → rocks formed from the cooling a magma beneath the earth's surface

   True        False

5. basaltic rock → light colored, made from magma with high silica content, containing mostly quartz and feldspars

   True        False