Plate Tectonics 1
In this type of boundary, plates are moving towards each other.
convergent boundary
In this type of plate boundary, plates are moving apart.
divergent boundary
In this type of boundary, plates slide against each other.
transform boundary
Which type of crust is denser (heavier). Oceanic or continental?
oceanic crust
The thickest of the four layers.
mantle
What boundary caused the Mid-Atlantic ridge?
divergent boundary
What is likely to occur when two continental boundaries collide?
mountains or earthquakes
New oceanic crust is created at what type of boundary?
divergent boundary
Why does oceanic crust subduct beneath continental crust?
It is denser
List the layers of the earth in order.
crust, mantle, outer core, inner core
What causes earthquakes?
Transform boundaries-continental plates rubbing against each other causing friction-creating a build-up of pressure.
The layer of earth where convection currents occur.
mantle
What oozes out of the earth when plates diverge?
magma
What piece of equipment measures earthquakes?
seismograph
What was the supercontinent originally called?
Pangea
Which country experiences more earthquakes- Indonesia or Australia? Why?
Indonesia-because it is on a plate boundary / fault line
Why Australia has experienced volcanic eruptions in the past?
It has in the past experienced volcanoes due to weak spots or hot spots in the Earth's crust
When one plate slides under another and melts into the mantle.
subduction
Which type of crust is thicker?
continental
List two pieces of evidence that supports Wegners theory of Continental Drift.
continental jigsaw
fossil clues
climate clues
rock clues
Explain two advancements in technology that reduce the impact of earthquakes.
detection technology
flexible & safer buildings
education & awareness
What is the difference between magma and lava.
magma-underneath the earth
lava-outside
What do continental to continental plate boundaries create?
mountains
Why does the total amount of crust remains the same despite new crust being regularly formed.
New crust formation at mid-ocean ridges rises and cools to form new crust.
Old crust is destroyed at subduction zones-crust melts into magma.
ONE (1) reason why oceanic crust will typically subduct beneath continental crust at a convergent boundary?
oceanic crust is denser (heavier) than continental crust