hazards

Question 1

what is a hazard

Answer 1

a perceived natural event that can potentially threaten life and property

Question 2

when is a natural event not a hazard

Answer 2

if it does affect life/ people.

Question 3

what is nuees ardentes

Answer 3

flow of ash a from a volcano;

Question 4

what are some examples of hydrological hazards

Answer 4

coastal flooding
glacial flooding
river flooding

Question 5

what are the 3 types of hazard

Answer 5

geophysical, hydrological, atmospheric

Question 6

what are some examples of atmospheric hazards

Answer 6

fires
high winds/ hurricanes
storm surges

Question 7

what is a disatster

Answer 7

the realisation of a hazard when it causes significant impact on vulnerable population the hazard exceeds the capacity and resilience level of the population

Question 8

what is meant by vulnerability

Answer 8

the risk of exposure to hazards combined with an inability to cope with them

Question 9

what are the characteristics of oceanic crust?

Answer 9

oceanic crust
- dense 3.0g/cm^3
- younger and temporary <200 million years
- composed of SIMA, silicone, magnesium, basalt
-thinner by 6-10km

Question 10

what are the characteristics of continental crust?

Answer 10

• thicker 30-70 km
• older and permanent >1500 million years
• lighter 2.6g/cm^3
• composed of mainly granate, silicon, aluminium and oxygen

Question 11

what happens to an oceanic crust when it encounters a continental crust?

Answer 11

the oceanic crust will sink beneath the continental crust as its more dense

Question 12

if the oceanic crust is more dense and therefore sinks beneath the continental crust what does this mean about the state of the continental and oceanic crust?

Answer 12

it means the oceanic crust is temporary as it is always changing but the continental crust is permanent

Question 13

what is different about the Eurasian plate?

Answer 13

its made up of oceanic and continental crust

Question 14

can the continental crust extend further than the margins of the landmass?

Answer 14

yes, for example, the under the north sea and off the west coast of the british Isles.

Question 15

how are mountains formed?

Answer 15

when two plates push up against each other on impact a mountain is formed

Question 16

what is the alternative to a mountain if 2 plates come into contact with each other

Answer 16

because plates cannot overlap, the oceanic plate sinks beneath the continental plate and is destroyed in the mantle

Question 17

what must be happening when older new oceanic crust is being formed?

Answer 17

it must be being destroyed (or continental crust is buckling creating new mountains

Question 18

what kind of movements are crusts moving in?

Answer 18

slow and continuous

Question 19

if there is a sudden movement of the crust its detected as a what?

Answer 19

an earthquake

Question 20

where are significant landforms such as volcanoes and deep sea trenches found?

Answer 20

plate boundaries

Question 21

what are the areas away from boundaries within plates known as?

Answer 21

shield lands