Hazards
What is a Natural Hazard?
A Natural Hazard is a natural phenomenon that might have a disastrous impact on people, property or the environment. For example earthquakes, tsunami and typhoons.
True or False 85% Volcanoes are on the Ring of Fire
False (75%)
Name two area where earthquakes happen
Japan, Indonesia
True or false the ocean has to be over 26 c°or 27 c°
False it has to be 26 c° or 27 c° for a few weeks
How is a landslide formed
A landslide is the movement of rock and earth down a slope without a moving agent such as a river
What is a Hazard Hotspot?
A Hazard Hotspot is a region that is vulnerable to two or more natural hazards if different. types. For example Philippines, Japan and Madargascar.
What is the meaning of:
Active-
Dormant-
Extinct-
Active- Erupting
Dormant- Hasn't erupted in a long time
Extinct- Can't erupt anymore
Preventive: prepare for earthquakes by trying to reduce the destruction that they can cause
Remedial: Coping as effectively as possible after an earthquake occurs
What are two things on a climate graph ( x axis and y axis)
temperature and rainfall
always true
What are convection currents?
Magma nearest the core is heated and rises to the surface, where it becomes more cool and then sinks. This creates convection currents.
Describe the 2 differences of shield and composite volcano
Composite cones are tall, cone shaped volcanoes that produce explosive eruptions. Shield volcanoes form very large, gently sloped volcanoes with a wide base.
State 3 examples of primary effects of earthquakes
Ground shaking, Roads cracking, building collapse
Describe the three structures of a typhoon
Eye, eyewall and spiral rainbands
State three reasons why landslides happen
The slope material becomes very heavy
The slope material becomes more lubricated
The slope becomes steeper
The slope material is pulled and pushed
What are the land forms of the three plate boundaries. (Mention the names of the plate boundaries and the landforms)
Constructive Plate Boundary: Ocean ridges, volcanic islands
Destructive plate boundary: Fold mountains, ocean ridges
Conservative Plate Boundary: Fold Mountains
Describe 3 volcanic hazards
Lava Fountain, Ash Cloud, Lahar, Volcanic Bombs, Pyroclastic flow
State 3 examples of secondary effects of earthquakes
Fires, Landslides, Tsunamis
What is the scale that records typhoons called and state how many levels it has
Saffir-Simpson Hurricane Wind Scale, 5 levels
State three engineering works to reduce the impact on landslides
Flexible barriers, cover the slops with concrete, surface channels etc.
One type of hazard that occurs one plate boundary
Volcanoes or earthquakes
How tall is Mount Merapi
2911m
What was the magnitude of the earthquake and how tall was the tsunami wave
9.1, 40 meters high
Explain how typhoons are formed
Warm air from the ocean rises then cools to form storm clouds, cold air sinks in the centre of the storm, then the air moves towards the high pressure centre creating strong winds, the typhoon will continue to grow until it moves away from the warm source of water.
Why did the emergency team dig for help by hands?
Because the machines were to heavy so they would sink in mud