Natural Hazards Flashcards
What is a natural hazard?
Extreme natural events that can cause loss of life and damage to property
What are the 4 layers of the earths core
Inner core, outer core, mantle, crust
How many km is the crust
60km
What are the inner and outer core made up of
Iron & Nickel
How thick is the mantle (km)
2900km
the earth is made up of 2 types of crusts what are they
Oceanic and continental
Characteristics of oceanic crust
Found underneath the oceon, denser than continental
Characteristics of the continental crust
Under continents ,less often destroyed, genrally older than oceanic
What is a destructive plate margin
Usally involves an oceanic plate, and also moves towards each other and can cause earthquakes
What is a contrsuctive plate margin
The plates move apart from eachother , then magma rises up to create a shield volcano
What is a conservative plate
The plates margin move past eachother, friction occurs and pressure builds up it eventully releases causing an earthquake
