Earthquakes
What causes earthquakes?
The movement of tectonic plates.
How are volcanoes formed?
Pockets of magma reaching the surface and cooling to hard rock.
What is a flood?
When water overflows onto land that is usually dry.
What is a tsunami?
A giant wave.
Where should you build to reduce the risk of flooding?
Elevated land. Away from coastal areas.
What happens during an earthquake?
The ground shakes.
What happens during a volcanic eruption?
What causes a flood to occur?
Intense rainfall, big storms, melting of ice and snow.
What causes tsunamis?
Underwater earthquakes and volcanic eruptions.
What is a seismograph?
Technology used to detect whether an eruption will occur (measures seismic activity).
Name one way to reduce the impact of earthquakes.
Have a disaster plan.
Build strong buildings that sway.
Where are most volcanoes found?
Fault lines / tectonic plate boundaries
How do floods spread diseases?
What are some negative impacts of tsunamis?
Wash away roads, destroy buildings, spread disease and pollution.
Cause injury to humans.
Contaminate wildlife habitats.
What is base isolation in buildings?
When a building's main structure sits on a bed of springs.
Earthquakes frequently occur at _____________.
Fault lines / tectonic plate boundaries.
What is pyroclastic flow?
Ash and dust that is released during an eruption and can travel hundreds of miles.
How are tsunamis and floods similar?
Both bring a lot of water on land creating damage.
Change the course of lava flow.
The central point of the earthquake is called...
Epicenter