Any biological loiving
substance poses a threat to
the health of people
Disease,
Forest fire
Some natural hazards can overlap categories, for
example tsunami can fit into multiple categories
because tsunami is created by the movement of
tectonic plates (geological Hazards) but the main
damage is done by water (Water Based Hazards)
Tectonic Plate
Crust is the outer layer of the
earth. It is very thin, between a
thickness of 6km and 7km
Constructive plate, movement of
the two plate moving apart,
magma rises up through the gap
forming a volcano
Destructive plate, occurs
when the oceanic plate is
being forced under the
continental plate, this may
trigger earthquakes
Oceanic and Continental plate differ because the
continental plate is lighter and thicker (made from
granite) than the oceanic which is thinner but
denser (made from basalt)
Conservative plate, occurs when
two plates slide past each other in
a different direction or in the
same direction but at different
speed
Mantle due to the high
temperature of thick layer, it has
consistency of jam. Temperature
range from mantle 5000 celsius
near the core to 1300 celsius just
below the crust
Reasons why people want to live near
volcanoes
Scientific purpose or
research
Fertile lands to
grow crops
Tourist attraction
Geothermal energy
Low house price
Beautiful sights
Inner core is solid, also made of iron. The
temperature in this core can be 5500 celsius