Igneous Rocks
Igneous Rock comes from what Greek word?
Fire
How are metamorphic rocks formed?
Extreme heat and pressure change the original rock into a new kind of rock.
What percentage of the earth is mad up of sedimentary rocks?
75%
The point where energy is suddenly released and an earthquake starts.
The focus
What is the difference between lava and magma?
Magma- molten magma found inside the earth
Lava- molten rock found on the surface of the earth
The percent of silica in a rock determines whether it is what two types igneous rock?
Mafic or felsic
What is the original rock is called before metamorphism?
Protolith or parent rock
What does the W stand for in the WDECC process?
Weathering
The point on the surface directly above the focus.
The epicenter
Where do volcanoes form?
Along plate boundaries, on land or under the sea.
Mafic rocks are _______ than Felsic rocks in color.
Darker
What is contact metamorphism?
An existing rock comes in contact with extreme heat.
What does the E stand for in WEDCC?
Erosion
What do you call scientists who study volcanoes?
Seismologists
What two words describe extinct volcanoes?
Inactive or dormant
What are the two main types of igneous rocks?
Intrusive- formed inside the earth
Extrusive- formed outside the earth
What is regional metamorphism?
When a rock is changed by extreme pressure.
What does the D stand for in WEDCC?
Deposition
How can seismologists predict earthquakes?
Plate movement
How are supervolcanoes formed?
Formed by huge collapsed craters called calderas.
How are igneous rocks formed?
What type of metamorphic rock does not have layers and bands?
Non-foliated
What do the last two C's stand for in WEDCC?
Compaction and cementation
What causes earthquakes to occur?
There is a slippage of rock and the build up of pressure is quickly released.
What is the caldera called that is near us and many people come to visit?
Crater Lake