Mod 1
Which layer of Earth is liquid?
Outer Core
Which type of metamorphism occurs within continent continent collisions as a result of the extreme pressure? (contact or regional)
Regional metamorphism
How is the principle of superposition used in relative dating?
layers at the bottom of a stack are oldest and progressively young upwards
There are two large continental glaciers on Earth - where are they?
Antarctica and Greenland
Name a chemical sedimentary rock made of carbonate minerals
limestone, dolostone, or chalk are all correct
What is the rock type that oceanic crust is made of
Basalt
How does a sediment grain change when it is transported for a long distance on a stream?
It becomes more rounded
Is an isotope with a half life of 50 million years appropriate to use to date a sample that is 200 million years old?
Yes - the age is within 5 half lives
How does increasing the amount of ash and dust in the atmosphere effect climate?
Which mineral group reacts readily with acid?
Carbonates
If oceanic crust converges with continental crust - what type of plate boundary will form?
Subduction zone
Do igneous rocks that have a large grain size form at the surface or underground?
underground
What type of unconformity occurs when there is igneous or metamorphic crystalline rock below the unconformity surface?
Nonconformity
oxbow lakes
What is the oldest eon of Earth History?
Hadean
Is the East coast of North America a passive or active margin?
passive
Outcrop exposes layers of well-rounded and well-sorted sandstone containing ripple marks and fragments of broken marine shells. What is the depositional environment?
Beach
In which eon of geologic time did continental crust first form?
Archean
Overdrafting groundwater wells in coastal areas can lead to _____
Salinity contamination
Why does continent-continent convergence NOT lead to subduction?
Continents are are not dense enough to subduct
If a rock experiences high strain rate and low pressure, is it more likely to deform in a brittle or ductile fashion?
brittle
How does fractional crystallization change the composition of the remaining magma in the chamber?
The remaining magma becomes more felsic
If you use zircon geochronology to date zircon grains in a clastic sedimentary rock - with the calculated age tell you the age of the sediment layer?
No - it will tell you the age of the rocks that the grains originally weathered out of
If a river is carrying a heavy sediment load, has easily erodible banks, and fluctuating water volume, what type of stream is likely to form?
Braided stream
Uniformitarianism