our restless planet Flashcards
what are the names of the four layers in the earth
inner core, outer core, mantle and crust
what are both inner and outer cores made out of
iron and nickel
how thick is the inner core
1200 km
how thick is the outer core
2200 km
how thick is the mantle
2900 km
how thick is the crust
about 35 km
there are two types of crust, name them
continental and oceanic
what is the continental crust mainly made out of
granite
what is the oceanic crust mainly made out of
basalt
what is a trench
small valleys or mountains on the ocean floor
what is an earthquake
the rock suddenly shifting
what is a volcano
the liquid rock bursting out through the earth’s hard surface
what is a lithosphere
the mix of curst and upper mantle
what is a convection current
the movement to change the form of the earth
what is a seismic wave
the energy stored when an earthquake is occuring
what is the focus
the point of where the earthquake happens
what is an epicentre
the point above the epicentre on the crust
what is a tsunami
the earthquake that is happening on the ocean floor causing the waves to go in different directions
what are some damages a earthquake can do
land slide
fire homes
water mains sopen
tsunami
what are the small earthquakes called after the main earthquake
aftershock
what is a seismometer
a machine used to measure the earthquake in the wave form
what is a magnitude
the amount of energy being released because of an earthquake
when does the earthquake become alot more dangerous when it reaches a point
when it is at 5
what is a richter scale
the scale used to specify of how the dangerous an earthquake is
