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geography

tectonic landscapes

QuestionAnswer
divergent plate boudary divergent plate boundaries occur when two plates move away from eachother
convergent subduction plate boundary convergent plate boundary occur what an oceanic plate is forced under a continental plate
convergent collision plate boundary collision plate boundaries occur when two continental plates move towards eachother
conservative plate boundary conservative plate boundaries is when two plates move side by side
example of divergent plate boundary north american and Eurasian plate
example of convergent subduction plate boundary pacific plate and the eurasian
example of convergent collision plate boundary indo-Australian and the Eurasian plate
example of conservative plate boundary north american plate and the pacific plate
what happens when an oceanic plate meets a continental plate? oceanic crust is denser than continental crust so the continental crust forces the oceanic crust underneath it. this is a process called subduction. at the subduction zone a deep sea trench is formed where the plate is being forced downwards.
what happened when a continental plate meets a continental plate? when continental plate meets a continental plate neither can subduct the other because they both have the same density. the rocks crumble together to make massive mountain chains like the himalayas
what happens when plates pull apart? there can never be any gaps on earth so when the plates move apart magma rises from the mantle and solidifies in the space, this happens one the sea floor and it is called sea floor spreading
what happens when plates slide side by side? when plates move along side each other in the opposite direction , earth quakes occur, the edges are all jagged, this makes the pressure to build up within the cracks, making really powerful earthquakes
what are hot spots? hot spots are not found on plate boundaries, but can be in a middle of a plate. a hot plume rising from the center of the earth melts through the plate above creating a volcano. the plate continues to move over the plume. this creates a line of volcanoes
how are earthquakes measured? mercalli scale and Richter scale
what is the mercalli scale? it is based of observation, measures the intensity. measured on a scale 1-12, measured by people, you have to be there to measure it
what is the Richter scale? is based on accurate measurments,measures the magnitude of an earthquake, measured on a scale from 1-9, measured by a seismograph, you do not have to be there to measure it.
Created by: jack rowlands
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