What's a tropical Cyclone?
Large areas of very low pressure with wind speeds of over 119 km h-1
True or false? When a tropical cyclone passes over land or a cold ocean current it loses the source of energy and the speed increases.
False!
What's a drought?
When there is a lack of rain or less rain than normal over a long period of time.
How is a tropical cyclone formed?
.
Why do earthquakes take place?
They result from the build up and sudden release of tension, usually along a fault line.
What does a storm hydrograph show?
It shows how quickly a river responds to a rainfall event.
What's the epicentre of an earthquake?
the point on the Earth's surface directly above the focus
What's the focus of an earthquake?
the location under the Earth's surface where an earthquake originates
Name and explain 2 human causes of flooding.
Deforestation, urbanisation, Agriculture, climate change
Name 2 geological hazards
earthquakes, volcanic eruptions
How can human activity influence the effect that drought has on a region?
Agriculture (irrigation, overcultivation, overgrazing), deforestation, dams
True or false? Percolation is the vertical movement of water from the soil into underlying rock
True!
What's a natural hazard?
a physical event that has the potential to cause loss of life or injury and damage property and infrastructure.
What's flooding?
When the discharge of a river exceeds the capacity of the river's channel.
True or false? Cyclones always take girls' names
False!
Name 2 climatic hazards
droughts, tropical cyclones, floods
Name and explain 2 physical causes of flooding.
Weather, previous weather, soil and rock type, relief, Earthquakes, volcanoes and tropical cyclones.
Name the 3 kinds of boundaries between tectonic plates
Conservative, constructive, destructive
Name 2 ways of categorizing natural hazards.
Causes, magnitude, speed, duration, frequency
Name 2 differences between oceanic and continental crust
.
Name 2 typical weather conditions when a tropical cyclone approaches.
Cloudy, increasing wind speed, air pressure falls, heavy rainfalls
What's a volcano?
a hole or crack (fissure) through which magma erupts onto the surface
What are tectonic plates?
a piece of the lithosphere that moves slowly on the asthenosphere.
Name 2 differences between shield and composite volcanos
.
What connection do some scientists make between climate change and drought?
They predict that warmer worldwide temperatures will mean decreased rainfall in some parts of the world, leading to more drought events