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PLate tetonics and earth quakes
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23
Science
10th Grade
05/07/2010

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Term
Sea Floor spreading
Definition
Occurs at mid ocean idges and subduction occures at deep ocean trenches.
Term
Divergent Boundries
Definition
2 plates moves away from each other
- Creates valleys, or rifts, smal volcnoes and shallow earth quakes
Term
Convergent Boundries
Definition
Two plates moving towards each other
-Creates mountians tenches subduction zones colvanoes and earth quakes
Term
Transform Boundries
Definition
Two plates roghly sliding past each other
- Creates Earhquakes and strike a faults are reated
Term
Three forces work together to move Tetonic Plates
Definition
MANTLE PLATE- Plates float and flow atop semi liquid
RIDGE PUSH-
Newly formed floor pushes plates apart
STAB PULL-
Sinking of plate at subduction Zone pulls entire plate alone
Term
Ocean Trenches
Definition
Lie alng convergent ocean boundries
Term
Mid Ocean Ridge and Rift Valleys
Definition
Mark divergent Boundries
Term
Hot Spots
Definition
Rising plumes of ho mantle magma Creates volcanic belts along the edge of continents. as subducting plates is melted and rises as magma.
-Creates island chains
Term
Earth Quakes
Definition
Results when tetonic forces over come the friction between to plates.
Term
Focus
Definition
Location of the earth quake within Lithospear
Term
EpicCenter
Definition
Surface location above the focus of the earth quake
Term
Body Waves
Definition
Travels through the layers of earth
Term
Primary waves
Definition
Compressde waves pass through ALL layers of the eart, Fast acuse particles vibrate
Term
Secondary Waves
Definition
Created when body waves reach surface traveling along the outside of the earth
Term
Ridge Push
Definition
Heat rises to the crust and expands. Makes the crust thiner and it cracks open. Magma comes to surface. as it cools magma pushes plate apart.
Term
Stab Pull
Definition
litohspear continues to cool as its moved away from the sperading ridge,, Oceanic plates becomes heavy and sinks down about 700 kn diwb tge temperature and pressure softens the plate recycling it into the mantle
Term
Seismic Waves
Definition
EarthQuakes transmit Mechanicla energy in form of seismic waves, There are two main types of Seismic waves Body and Surface waves
Term
Primary Waves
Definition
(P-WAVES) are compression waves the particle o the medium vibrate. P-WAVES- travels fast and can travel through solid liquid or gas. the pass through all layers of the earth
Term
Secondary Waves
Definition
(S-WAVES) are shear waves they vibrate perpendiculat to the direction of the wave. They travel more slowly and can travel only thoug solid rock not through the liquid core.
Term
BOTH P & S WAVES...
Definition
Measures the changes in waves speed and direction and has provided evident about the earth structre of the planet
Term
SURFACE VS BODY WAVES
Definition
Surface waves travel on the outside of eart causing the most destruction
Body waves travels more sloyly and die within a few kilometers.
Term
CONVERGENT BOUNDRIES
Definition
oceanic- Oceanic Convergent Boundries creat Islands
Oceanic- Continental Convergent boundries creat deep ocean trenches
Continental- Continental convergent boundries creat inland mountain ranges
Term
LithoSpear
Definition
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