natural hazards Flashcards
geological hazards
occur due to tectonic plates. they include volcanoes and earthquakes.
meteorological hazards
occur due to weather and climate. include extreme weather and tropical storms.
the earths crust is separated into … that float on the …
tectonic plates
mantle
what are the two types of crust ?
continental and oceanic
continental crust
thicker and less dense
oceanic crust
thinner and more dense
what are the three types of plate margins ?
destructive , constructive , conservative
destructive margins
where two plates move towards eachother. when oceanic and continental meet, the oceanic is destroyed. volcanoes are formed here.
constructive margins
where two plates move away from eachother. this causes the mantle to release magma to fill gap , creating new crust.
conservative margins
where two plates slide past eachother but at different speed. no crust is formed or destroyed.