Rock Formation and Other Vocab
What is the Geologic Time Scale?
A ¨calendar¨ of Earth´s different time periods
What Rating does Talc have on the Mohs Hardness Scale?
Talc is rated a one on the Mohs Hardness scale.
Are inclusions older or younger than the rock that they are in?
Older.
What is the earliest era that represents 88% of earth history?
Precambrian.
What are the names of the three major rock types that re part of the rock cycle?
Igneous, Sedimentary, Metamorphic.
What is a Paleontologist?
One who Studies life forms that existed in a previous time period.
Perfect cleavage is a break in a rock that is without rough surfaces, how a rock should break.
If layer A is above layer B but fault F cuts both of them which letter is the youngest?
F
How many years is an eon.
One billion years.
What is deposition?
When rocks or sediment is carried form one place to another.
How are igneous rocks formed?
They are from by the crystallization of magma or lava.
What common household use does Halite have?
Halite is used almost exclusively as table salt.
What does the Law of Lateral Continuity (LLC) state?
That all sediment deposits are originally deposited horizontally.
What is the half life of Uranium 238?
4.5 billion years.
Compaction and cementation has to do with which type of rock?
Sedimentary.
Sedimentary rocks are formed from sediment that has been compressed to make a rock.
What is the 2nd most common mineral?
Quartz.
What does the Principal of Cross Cutting Relationships state?
That a vein or fault is always younger than the rock it cuts
If Buck begins with 12 kgs of Uranium 238 than how many kgs will remain after 9 billion years?
3 kgs
Cooling and crystallization has to do with which type of rock.
Igneous rock.
How are metamorphic rocks formed?
Metamorphic rocks are formed from rocks that have been changed due to high heat and pressure
What mineral has an octahedral cleavage plane?
Dimond.
What does the Law of Superposition state.
That younger rocks sit above older ones.
What two Eras are named after US states?
The Pennsylvanian and Mississippian.
What is weathering and erosion?
Weathering and erosion is the breaking down of minerals and rocks on earth surface.