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Our Natural World - P1
Global Hazards
Tectonic Hazards
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Types of plate boundaries
Our Natural World - P1 > Global Hazards > Tectonic Hazards
6 cards
Cards (18)
Tsunamis
are large ocean waves that are usually caused by underwater
earthquakes.
How do volcanoes form?
Magma
from beneath the crust breaks through and over time
cools
over and over again - eventually becoming a volcano.
What are examples of chemical hazards?
Toxic
substances,
flammable
materials,
corrosive
chemicals,
and reactive
compounds.
What does the term 'epicentre' mean?
The point directly above the
focus
, where the seismic waves reach the surface first.
What are seismic waves?
Energy
waves
that travel out from the
focus
of an earthquake.
What is the focus of an earthquake?
The point at which
pressure
is
released
- the original point.
What does the term 'deep focus earthquakes' mean?
Usually
small
and
common
Seismic waves spread and damage
wide
area
What dose the term 'shallow focus earthquakes' mean?
Occur on
destructive
margins
Damage is
localised
as seismic waves travel
vertically
but is more
powerful
than deep focus earthquakes.
What are some ways to predict earthquakes?
Satellite
surveying (tracks changes in the earth’s surface)
Seismometers
Laser
reflectors
(surveys movement across fault line)
How are earthquake proof buildings made in LIDCs?
They’re made out of
light
materials.
Foundations
are built into the ground for extra support and to
absorb
seismic waves.
What are some ways to protect against earthquakes?
Building earthquake-resistant buildings
Raising public
awareness
Improving earthquake
prediction
systems
How are earthquake proof buildings made in ACs?
Foundations
are built into the ground for extra support and
absorb
seismic waves.
Buildings are built to
wobble
to
absorb
seismic waves.
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