Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
25 Cards in this Set
- Front
- Back
|
What are the three types of plate boundaries?
|
Divergent, Convergent, Transform
|
|
|
What are the two types of divergent boundaries?
|
Mid-Ocean Ridges, Continental Rifts
|
|
|
What happens when oceanic crust departs from oceanic crust?
|
Mid-ocean ridge is formed.
|
|
|
What happens when continental crust departs from continental crust?
|
Continental Rift is formed
|
|
|
What is the most popular example of a continental rift?
|
The East African Rift Valley
|
|
|
What forms from the separation of a continental rift?
|
A rift volcano
|
|
|
What are the three types of convergent boundaries?
|
Island Arc Subduction, Orogeny, Volcanic Mountain Chain
|
|
|
What happens when Oceanic crust comes together with oceanic crust?
|
One oceanic plate subducts under other, Island arc is created, series of volcanic islands; Island Arc Subduction is formed
|
|
|
What is a popular example of Island Arc Subduction?
|
The Carribean Lesser Antilles
|
|
|
What happens when continental crust meets continental crust?
|
Orogeny is formed
|
|
|
What is a popular example of an orogeny?
|
The Himalayas; the indian plate and the eurasian plate smashing together (everest)
|
|
|
What happens when Continental crust meets oceanic crust?
|
oceanic crust subducts under, forming trench, magma forms from H20 and "leaching" from subduct slab; Volcanic Mountain Chain is formed
|
|
|
What is a popular example of a Volcanic Mountain Chain?
|
The Andes Mountains (South America)
|
|
|
What is a transform Boundary?
|
When two tectonic plates move past each other
|
|
|
What are the two types of transform Boundaries?
|
Right Lateral - driving on wrong side of road
Left Lateral - driving on right side of road |
|
|
What is a popular Transform Boundary, and what type of transform Boundary is it?
|
The San Andreas Fault, it is a Right Lateral boundary
|
|
|
What is an active continental margin? A passive one?
|
The edge of the continent is the same as the edge of the tectonic plate; vice versa
|
|
|
True or False: The east coast of N. America and the west coast of Africa are both tectonically active.
|
False
|
|
|
What are the two problems with the Convection Currents Hypothesis?
|
1. no global arrangement of convection cells that works with seen plate motions
2. the direction of plate motion doesn't always go with direction of convection in asthenosphere |
|
|
What two things are suggested to drive plate motions?
|
Ridge Push and Slab Pull
|
|
|
True or False: Ridge Push occurs from the pressure of rising magma forcing the plates away from the center.
|
False
|
|
|
Ridge Push
|
The force of gravity pushes down on ridge, causes it to move away from midoceanic ridge
|
|
|
Slab Pull
|
slab moving away cools, and becomes denser than asthenosphere
|
|
|
What happens to subducted slabs
|
They are recycled into lower mantle
|
|
|
What is the technology used to observe subducted slabs (similar to CAT-SCAN)?
|
Seismic Topography
|
