Shared Flashcard Set

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First section
study girl
15
Geology
Undergraduate 4
09/13/2012

Additional Geology Flashcards

 


 

Cards

Term
Aurora Borealis
Definition
charged particles from solar wind follow the magnetic field lines, and can be seen at the poles
Term
geomagnestism
Definition
combined spin of the earth and convection in the outer core generate earths magnetic field
Term
Our solar system consists of
Definition
-4 inner terrestrial planets
-4 outer jovian planets
-satellite planets
-astroid belt
-kuiper belt
Term
Wadati-Benioff Zone
Definition
Zone of shallow to deep focused earthquakes along the descending slab
Term
Mantle Convection
Definition
one of several forces acting on plates
Term
what drives plate motions?
Definition
older models relied on whole mantle convection, like a conveyor belt
Term
Mantle Plume
Definition
Is a fixed source of magma that rises from a deep in the mantle.
Term
Continental Crust
Definition
Dominant rock=granite
thickness=20-70 Km
density=2.7 g/cm3
Term
Oceanic Crust
Definition
dominant rock=basalt
thickness=3-5 km
density=3 g/cm3
Term
Paleomagnetic signature frozen in a rock has 3 components
Definition
1. polarity
2. declination
3. inclination
Term
fracture zones
Definition
linear features in ocean crust produced by offsets in axis of oceanic ridge
Term
Collision
Definition
occurs when 2 continents converge
Term
Suture zone
Definition
marks the place where the collision happened
Term
subduction
Definition
occurs when a ocean plate converges with a continental plate or another ocean plate
Term
Active margin
Definition
plate boundary occuring along edge of a continent

3 types: convergent, divergent, transform
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