Boundaries
Plate Tectonics
Causes
Locations
Theories
100
What are the three types of boundaries?
Convergent, Divergent, Transform Boundaries
100
Which layer of Earth is most like the oobleck we talked about in class?
- Lithosphere
- Asthenospher
- Outer core
Asthenosphere
100
Convergent C-C boundaries produce ____________.
a) volcanic arcs
b) trenches
c) rift valleys
d) folded mountain ranges
d) folded mountain ranges
100
What type of plate boundary is this?
Convergent
100
Who discovered seafloor spreading?
Harry Hess
200
At what type of boundary is crust destroyed?
Convergent Boundary
200
What layer of the earth makes up the plates?
lithosphere
200
What type of convergent plate boundary produces volcanoes? (Hint: there are TWO correct answers)
O-O
O-C
C-C
O-O AND O-C
200
Is subduction occuring in this diagram:
YES
200
List the 4 types of evidence that Alfred Wegener used to prove the existence of a supercontinent in the past
- continents fit together like puzzle pieces
- mountain ranges match up on different continents
- fossils match up on continents\
- climate mysteries were explained (tropical plants in places that are now cold. Glacial features in places that are now hot.)
300
At what type of boundary is new crust formed?
Divergent Boundary
300
Which type of crust is more dense:
Ocean crust OR Continental Crust
Ocean crust
300
Which type of crust is older and thicker?
Ocean or Continental?
Continental
300
Why does ocean crust sink into the mantle at a convergent plate boundary?
Ocean crust is more DENSE than Continental crust so it sinks down into the mantle and is destroyed.
300
List two discoveries about the sea floor of the Atlantic Ocean that helped prove the theory of plate tectonics!
- magma was rising at mid-ocean ridges, making new crust, and pushing the crust apart
- the age of rocks get older as you move away from the mid-ocean ridge
400
At what type of boundary is crust neither made nor destroyed?
Transform Boundary
400
What causes plates to move?
Convection currents
400
Explain how a Hot Spot formed Hawaii.
Hot spots stay still but plates move over time creating a string of volcanoes of different ages
400
What mountain range is formed by continental-continental boundaries?
Himalayan Mountain Range (Himalayas)
400
Explain two reasons Wegener’s ideas were never accepted
- He couldn't explain how the continents moved
- He was a meteorologist
500
Name the three types of convergent boundaries.
continental-continental (C-C)
oceanic-oceanic (O-O)
oceanic-continental (O-C)
500
Where do most of the earth's volcanoes and earthquakes occur?
Plate Boundaries
500
On average, the plates move at a rate of _______.
a) 2-4 mm/year
b) 5-10 cm/year
c) 5-10 km/year
d) They do not move.
b) 5-10 cm/year
500
How does a trench form?
A trench is formed by O-O and O-C convergent boundaries. A deep trench occurs where the ocean plate subducts into the mantle.
500
Which diagram best shows the magnetic pattern and relative age of the igneous bedrock on the west side of the ridge?
