Tectonic Plates 1
In this type of boundary, plates are moving towards each other.
convergent plate boundaries
In this type of plate boundary, plates are moving apart
divergent plate boundaries
What is the thinnest part of the earth?
the crust
In this type of boundary, plates slide against each other
transform plate boundaries
Explain Alfred Wegener's theory of continental drift
Continents were once together in a supercontinent (Pangaea). Convection currents in the mantle began to push the tectonic plates apart. Gondwana and Laurasia were formed. Over time, the tectonic plates further drifted apart, forming the world we know today.
Where do tectonic plates interact?
boundaries
What lies directly beneath the crust
the mantle
Alfred Wegener's evidence for continental drift theory
Fossils, geology, climate, shape of continents
What is the most inner layer of the earth
the inner core
Name the two different types of crust
oceanic and continental
What happen to magma when it cools down?
it becomes a solid
Where do convection currents occurs?
the mantle
What causes the plates to move?
convection currents in the mantle
the pulling force exerted by a cold, dense oceanic plate plunging into the mantle due to its own weight
slab pull
An unusually hot part of the mantle that rises to the crust causing volcanic activity
Hot spot
Transform boundaries create this
earthquakes
Divergent plate boundaries create this
islands, underwater volcanoes, mid ocean ridges/rift valleys
cracks in the earth where plates slide against one another
a fault
When a plate slides under another
subduction
Describe the differences between oceanic and continental boundaries. (2 things)
extra points for more
oceanic thinner (6-7km), less dense : continental ticker (40km), more dense
A continental plate converging with a continental plate creates this
a mountain
The rigid outer part of the earth, consisting of the crust and the upper mantle
Lithosphere
What are the some of the largest mountains created by convergent plate boundaries?
the Himalayas
What are the three types of boundary interactions?
Convergent, Divergent, Transform
What 2 things do oceanic to continental convergent plate boundaries create?
volcanoes on land and trenches in the ocean