Rock Classification Quiz

What are the three main categories used to classify rocks?

• Intrusive, Extrusive, Foliated

• Granite, Basalt, Marble

• Clastic, Chemical, Biologic

• Sedimentary, Igneous, Metamorphic

Which type of sedimentary rock is formed from bits of older rocks?

• Biologic

• Metamorphic

• Clastic

• Chemical

Which type of rock is formed from once-living organisms?

• Biologic sedimentary

• Chemical sedimentary

• Clastic sedimentary

• Intrusive igneous

What is a common example of an intrusive igneous rock?

• Limestone

• Slate

• Granite

• Basalt

How are foliated metamorphic rocks characterized?

• By their rounded pebbles

• By their large crystals

• By their layered appearance

• By their silica content