ANSWERS
1. What is a rock? (p28)
2. How are rocks different from minerals? (p28)
3. How are rocks classified? By how they are formed and by texture and
composition
4. How are igneous rocks formed? From molten rock material (magma or lava)
5. How are igneous rocks classified? By texture-(crystal size) and composition
6. What is the difference between intrusive and extrusive igneous rock? (p37)
7. Be able to classify and identify granite, obsidian, pumice, basalt, rhyolite, and
porphyry.granite is the only intrusive rock of the 4 listed. A porphyry may start
as intrusive and then cool at the surface (extrusive)
8. How are sedimentary rocks formed? Most are formed form broken down rock
particles carried by wind and water
9. How are sedimentary rocks classified? By how they are formed and by texture and
composition
10. What are the three classes of sedimentary rock? (pp41-42)
11. Be able to classify and identify conglomerate, sandstone, shale, limestone, coal,
rock salt, and rock gypsum.conglomerate, sandstone, shale :Clastic,
limestone, coal : Organic, rock salt, rock gypsum : Chemical
12. How are metamorphic rocks formed? Heat, pressure, or chemical rxns applied to
existing rock
13.How are metamorphic rocks classified? By foliation (texture) and composition
14.What are the two classes of metamorphic rock? Foliated and nonfoliated
15.Be able to classify and identify gneiss, talc schist, garnet schist, slate, quartzite,
marble. gneiss, schist, slate : Foliated
quartzite, marble : nonfoliated
16.Identify the parent rock of the following metamorphic rocks: gneiss, slate, quartzite,
marble.
gneiss : granite, slate: shale, quartzite : sandstone, marble : limestone
17.What is the rock cycle? (pp30-31)
18.What is weathering? (p29)
19.What is erosion? (p29)
20.Explain how each rock type can be transformed into another. (pp30-31)
21.What is the difference between mafic and felsic composition of magma? (p37)
22.Identify some rocks that are felsic and some that are mafic. (p37)
23.What is the difference between contact and regional metamorphism? (p45)