Natural Hazards Flashcards
what are the two types of crust?
oceanic and continental
what is a plate margin?
where two or more tectonic plates meet
what islands do the pacific ring of fire encapsulate?
the Philippines
how do volcanic eruptions happen on a destructive plate boundary?
the oceanic plate melts in the mantle to form magma. this magma rises through weaknesses in the rock through a composite volcano
what is a collision plate boundary?
two continental plates move towards each other. this collision can create fold mountains. and earthquakes can happen
what happens at a constructive plate boundary?
plates move away from each other
how do shield volcanoes form at a constructive plate boundary?
magma rises from the mantle to form new land in the form of a shield volcano
why do constructive plate boundaries happen?
convection currents
what happens at a conservative plate boundary?
plates move past each other at different speeds
what is the definition of a natural hazard?
a naturally occurring event with the potential to cause damage destruction or death to human life.
what are factors affecting hazard risk?
frequency, population density, magnitude, level of development, prediction
why do people live in areas at risk from tectonic hazards?
fertile soils, geothermal energy, tourism
what are the 4 strategies used to reduce hazard risk?
prediction, planning, protection, monitoring
which piece of equipment helps monitor volcanoes AND earthquakes?
seismometers
how do seismometers help with reducing hazard risk?
they detect movements in the Earth so can see foreshocks and tremors
