Geography Terms Flashcards
(27 cards)
core
the innermost part of the earth
mantle
a zone in the earth between the core and crust
convection currents
in the mantle the rising and falling of molten lava causes plates to move
crust
the outer most layer of the earth
tectonic plates
pieces of the earths crust that makes of the earth
plate boundaries
where the plates meet
fault-line
a break in the earth where movement occurs
subduction zone
when two plates come together and one goes on top of the other
convergent plate boundary
where two or more plates collide, one sliding below the other (subduction)
divergent plate boundary
when two tectonic plates move away from each other, molten rock rises
transform plate boundary
when two plates slide past each other
collision plate boundary
when two plates collide and land fold upwards creating mountains
epicentre
a place on the crust of the earth directly above where the earthquake started
focus
the point underground where the earthquake started
seismic wave
the vibrations from the earthquake
seismometer
a device used to record vibrations from an earthquake
primary waves
the first set of waves, quick
secondary waves
a second set of waves, cause rocks to change shape
rayleigh waves
waves which include longitudinal and transverse waves
love waves
surface waves which has a side to side motion
richter scale
what is used to measure energy released during earthquake (magnitude)
modified marcalli scale
an intensity scale which calculates total distruction
aftershock
same size or smaller earthquake which comes after original one
intensity
the measure of how server the shaking was at particular site
