Structure Of The Earth Flashcards
Th earths crust is broken into enormous sections called
Tectonic plates
Convection currents
the plates floating on the mantle are made to move by convection currents
What are lines of latitude and longitude
Imaginary lines that go around the earth.
What do lines of latitude do
Show how far north or south a place is
Where are lines of latitude measured from
The equator
What do lines of longitude do
Show how Far East or west a place is
Where are lines of longitude measured from
Greenwich meridian line
What happens at a conservative plate boundary
Plates slide against each other. When these plates get stuck, friction builds up until they can’t take any more stress and they jump free, causing an earthquake.
The earths structure is like
a cracked boiled egg
Collision plate boundary
The crust crashes together and starts to be forced upwards creating fold mountains
Constructive plate boundary
Plates move away from each other. Known as diverging plates. As the plates move away magma can five its way to the surface to fill the gap, creating new land
Destructive plate boundary
One type of crust is continental and one is Oceanic. When they meet the oceanic crust gets pulled down as it is heavy. The friction caused when it sinkscreats huge earthquakes and the crust re melts and gets forced upwards to form a volcano
What is a volcano
An opening or rupture in a planets surface or crust which allows :hot magma, volcanic ash and gases to escape from below the surface
List 3 benefits of living near a volcano
The volcanic rocks provide building materials and valuable minerals
85% of homes in Iceland are heated by geothermal energy (boiling underground water)
Greenhouses producing :tomatoes, cucumbers and flowers are heated using geothermal energy
What causes an earthquake
A sudden movement between the plates
