Landforms
Earth's Layers
Plate Boundaries
More Landforms
All things Plate Tectonics
100
What geographical feature forms on the ocean floor at a divergent boundary?
Mid Ocean Ridge
100
What type of crust is most dense?
Oceanic
100
How do plates move at a divergent boundary?
Away from each other
<--- --->
100
Sea floor spreading is evidence of which kind of boundary?
A divergent boundary on the ocean floor
100
What is the name of the super continent that was formed prior to the continents drifting apart?
Pangea
200
What can occur at ALL tectonic plate boundaries?
Earthquakes. But they occur most often at transform boundaries.
200
As you move through Earth's Layers towards the inner core, density ___________.
Increases.
Along with heat and pressure.
200
How do plates move at a convergent boundary?
Toward each other
---> <---
200
A volcanic island is evidence of which kind of plate boundary?
Convergent boundary
Oceanic crust interacting with oceanic crust
200
Who came up with the theory of Continental Drift?
Alfred Wegner
300
What occurs at a divergent boundary on land?
Rift Valley
300
Which components are the inner and outer core mostly composed of?
Iron and Nickel
300
How do plates move at a transform boundary?
Slide past each other
--->
<---
300
What two things occur at a transform boundary?
Earthquakes and Faults
300
Describe what happens to cold material in a convection current.
Cold material cools down, becomes more dense, and sinks.
400
What two geologic features form at a convergent boundary where oceanic crust interacts with oceanic crust?
Ocean Trench and Volcanic Islands
400
Which elements are the crust mostly composed of?
Silicon and Oxygen
400
When two plates move towards each other, one plate sometimes moves under the other. What is this called?
Subduction
400
What geologic feature forms at a convergent boundary where continental crust interacts with continental crust?
Folded Mountains
400
Describe what happens to hot material in a convection current.
Hot material melts, becomes less dense, and rises.
500
The San Andres Fault is on a transform boundary. What would occur if this were a convergent boundary?
Folded Mountains
500
Compared to Earth's crust, Earth's core is believed to be ...
more dense, hotter, and under more pressure
500
Oceanic crust that is 75 years old is interacting with oceanic crust that is 50 years old at a convergent boundary. What happens to the 75-year-old crust and why?
It subducts under the 50-year-old crust because older crust is more dense therefor it sinks.
500
What two geologic features form at a convergent boundary where oceanic crust interacts with continental crust?
Oceanic Trench and Volcanic Mountains
500
Name a piece of evidence that supports the Continental Drift Theory.
Matching fossils on the continents of Africa and South America.
Fossils of tropical plants are found in Antarctica.
Fossils of the same species of extinct land plants have been found in both South America and Africa.