Tectonic Landscapes Flashcards
In a convergent ocean to land plate boundary, why is the oceanic crust push underneath the other crust and what is this called?
It is denser and heavier, subduction
In a divergent plate boundary, two _____ plates are moving _______.
oceanic, apart
What can divergent boundaries cause?
A chain of volcanoes (often underwater) and earthquakes
Where are divergent boundaries found?
The centre of the atlantic ocean
Why do convergent ocean to land boundaries cause volcanoes?
The oceanic plate is pushed into the mantle and melts to form magma, creating volcanoes.
Where do destructive boundaries occur?
Around the pacific ocean
What is formed by a collision plate boundary?
Fold mountains and earthquakes can be caused
Why are fold mountains formed
No crust is subducted so the crust folds up
What do transform boundaries cause?
Earthquakes
How can earthquakes be predicted?
Patterns, using lasers to detect movement and pressure (if water level changes in the ground)
How can volcanoes be predicted?
Earthquakes, gases, heat and movement (doming)
What is a focus?
The point underground where the plates move
What is a fault?
The boundary between two plates
What are seismic waves?
The energy released as plates move that causes the shaking
How does the richter work?
It measured an earthquake using a machine to record the strength of the shaking
How does the mercalli scale work?
It measures an earthquake by people judging the damage done
Name an advantage of the richter scale
It is accurate
Name a disadvantage of the richter scale
It is harder to understand than the mercalli scale
Name an advantage of the mercalli scale
It is good for an easily understandable idea of an earthquake
Name a disadvantage of the mercalli scale
Not very accurate
How does a rubber shock absorber reduce the effects of an earthquake
It allows yet restrains motion and absorbs resonant energy
Why do people continue to live in areas of crustal instability?
Fertile land, mining, advanced services and tourism
