Vocabulary
How Rocks Change
Foliation
Non-Foliated rocks
Metamorphic rocks
100
The process in which an existing rock is changed by heat or pressure or both.
What is metamorphism?
100
Because pressure and temperature increase with depth, rocks change when they are buried deeper in the crust.
Why do rocks change?
100
It develops when minerals flatten out or lineup in bands.
How does foliation develop?
100
They are rocks that do not show foliation.
What are non-foliated rocks?
100
It forms as existing rocks change.
Metamorphic rocks form as what changes?
200
When heat and pressure can break the bonds that join atoms in minerals. Then the atoms can join together differently as bonds form.
What is recrystallization?
200
When pressure causes the minerals to line up in layers.
When does shale change into slate?
200
When there is higher pressure and temperature the mineral mica can grow and make it shiny.
What makes a rock look shiny?
200
One reason is that it that it is made up of mainly one type of mineral.
What is one reason why a metamorphic rock might not show foliation?
200
When heat and pressure increases.
when do metamorphic rocks form?
300
an arrangement of minerals in flat or wavy parallel bands.
What is foliation?
300
It changes deeper in the crust, where the temperature and pressure are higher.
Where does slate change into phyllite?
300
When there are very high levels of metamorphism.
When does the minerals in a rock separate into light and dark bands?
300
A common ...... rock is marble
What is a common nonfoliated rock?
300
They develop bands of minerals.
What do most metamorphic rocks develop?
400
The original sedimentary or igneous rock.
What is a parent rock?
400
It changes when there is even higher temperature and pressure.
When does phyllite change into schist?
400
An arrangement of minerals in flat or wavy parallel bands.
What is foliation?
400
Another reason is that it has not been subjected to high pressure.
What is another reason why a rock might not show foliation?
400
They occur over large and small areas.
Metamorphic changes occur over what type of area?
500
A metamorphic rock that does not show foliation.
What is a non-foliated rock?
500
It changes deep within the crust.
Where does schist change into gneiss?
500
They either split easily into thin leaflike sheets or have bands of minerals that are lined up and easy to see
What do foliated rocks split into?
500
Another common........rock is quartzite.
What is another common nonfoliated metamorphic rock?
500
They can occur over hundreds of kilometers or over just a few centimeters.
Metamorphic changes occur over how big and how small areas?
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