January Exam 2019 Flashcards
what are convection currents?
when the mantle moves the plates float on the mantle and move around the Earth’s surface
name the 4 layers of the earth
Inner core
outer core
mantle
crust
what is the crust
70 km thick
made up of sections called tectonic plates
what is the mantle ?
up to 2900 degrees
semi-liquid ( consistency of jam )
what is the outer core?
up to 2200 degrees
liquid lare
what is the inner core
solid lare
name the 4 types of plate boundaries
destructive
constructive
collision
constructive
what are earthquakes?
vibrations of the Earth’s crust caused by movement at plate boundaries and major fault lines
what plate boundaries do most earthquakes occur at?
conservative and destructive
what are seismic waves
the focus
what do seismic waves do
move out from the point where the rocks of tectonic plates move
what is above the focus
the epicentre
what are earthquakes measured by?
the Richter scale
what instrument is used to measure vibrations of earthquakes
Seismograph
Name some short term impacts of earthquakes
electricity debris causes injury/death roads destroyed water or gas mains burst buildings collapse