6.4 Review

What are metamorphic rocks formed from?

• Sediment
• Magma/Lava
• Preexisting rocks
• Chemical Reactions

What is the result of the metamorphic process on a rock's structure?

• No change occurs
• The rock becomes less dense
• The rock becomes more porous
• Changes in chemical composition, texture, or structure

Which of the following can cause pressure and heat for metamorphism?

• Earth's atmosphere
• Yelling loudly at the rock
• Earth's internal heat and overlying rocks
• Ocean currents

What could happen to minerals in a rock under pressure?

• Minerals spontaneously combust
• New minerals appear
• Minerals become less dense
• No change occurs

What are the two basic types of metamorphism?

• Primary and secondary
• Local and regional
• Rapid and slow
• Extreme and mild

What is the main cause of regional metamorphism?

• Underground rivers
• Intense heat and pressure over large areas
• Volcanic eruptions
• Tsunamis

How is rock affected by contact metamorphism from hot magma?

• No changes occur
• Rock becomes less dense
• Rock becomes fine-grained
• Rock is altered and heated

Where does deformational metamorphism most often occur?

• On top of mountains
• At faults where rock masses pass each other
• Near the ocean floor
• In deep caves

What type of rock might shale become through contact metamorphism?

• Basalt
• Gneiss
• Hornfels
• Granite

How do altered rocks from deformational metamorphism usually compare to the surrounding rock?

• Completely different mineral composition
• They turn back into magma
• No changes in structure or texture
• Minor changes in structure and texture