Plate Tectonics 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
What is the name of the theory that states the earth's crust is made of large sections moving over the mantle.
Plate Tectonics
Where do tectonic
plates interact?
boundaries
What evidence
supports the theory of
continental drift?
Name 4.
Evidence that
supported his theory
and helped other
scientists accept it
pertained to rock
formations, rock
strata, coastline and
shapes of continents,
climate formations,
and most importantly
plant and animal
fossil evidence.
What is sea floor spreading?
The formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.
Compare a shield and composite volcanoes.
Composite cones are tall, cone shaped volcanoes that produce explosive eruptions.
Shield volcanoes form very large, gently sloped volcanoes with a wide base.
Why does oceanic crust subduct beneath continental crust?
Oceanic crust is more dense.
What is the theory of
continental drift and
who created it?
The continental drift
hypothesis was
developed in the early
of the 20th
century, mostly by
Alfred Wegener.
Wegener said that
continents move
around on Earth's
surface and that they
were once joined
together as a single
supercontinent.
Where do convection
currents occurs?
the mantle
What causes the plates to move?
convection currents in the mantle
What oozes out of the earth when plates diverge?
magma or lava once it erupts.
The biggest fault in California
the San Andreas Fault
Transform boundaries
create this
earthquakes
What is shearing,
compression, and
tension?
Compression stress occurs when an object is squeezed or shortened, tension stress occurs when an object is stretched or lengthened, and shear stress occurs when an object is twisted or experiences forces that cause different parts of it to move in different directions or at different speeds.
cracks in the earth where plates slide against one another
a fault
When a plate slides under another
subduction
Name the two different types of crust
Oceanic and continental
A continental plate
converging with a
continental plate
creates this
mountains
Which boundary does
a reverse fault have?
Reverse faults often
form along
convergent plate
boundaries.
What are the largest group of mountains created by convergent plate boundaries?
the Himalayas
What forms when continental and continental plate boundaries diverge?
Rift Valley
What do oceanic to continental convergent plate boundaries create?
Volcanoes on land and trenches in the ocean