Sea-floor Spreading
Landforms and Natural Disasters
Plate Boundaries
Convection Currents
Diagrams and Maps
100
Which landform marks the site for seafloor spreading?
a mid-ocean ridge
100
At which boundary do earthquakes occur?
transform boundary
100
Describe how plates move at a divergent boundary
plates are moving apart from each other
100
A conveyer belt is an analogy for _______ _________
convection currents
100
Which boundary is this?
Transform Boundary
200
At which boundary does seafloor spreading occur?
Oceanic divergent boundary
200
A mountain range is formed by which type of boundary?
Continental-continental convergent boundary
200
Describe how plates move at a convergent boundary
Plates are colliding
200
What is the heat source for convection currents in the mantle?
Outer and inner core
200
Which boundary is this?
Oceanic-oceanic convergent boundary
300
What is happening at an ocean trench?
subduction
300
What 3 things happen when an oceanic plate converges with another oceanic plate?
subduction, ocean trench, volcanic islands
300
Describe how plates move at a Transform boundary
Plates are sliding past each other
300
True or false, magma that is cooling down is rising within the mantle
false
300
What process is happening at this boundary?
new crust is forming/ seafloor spreading
400
If an ocean has more ocean trenches than mid-ocean ridges is it getting smaller or bigger?
smaller
400
What landform is created when two oceanic plates diverge?
a mid ocean ridge
400
In which layer of earth do we find plate tectonics?
lithosphere
400
What is an example of convection currents?
lava lamps
400
Which letter represents the oldest oceanic crust?
D
500
The further away from a mid-ocean ridge a rock sample is, it is _________ in age and ______ dense.
older more
500
How does a rift valley form?
two continental plates diverging
500
What are 3 things that can occur at an oceanic-continental convergent boundary?
subduction, ocean trench and a chain of volcanos
500
What is happening to the density of cooling magma?
it is increasing
500
What type of boundary is between the South American plate and the African plate?
oceanic-oceanic divergent boundary