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earth science (rawan

about earth science

QuestionAnswer
how fast are the plates moving? 1-2 cm per year
who first proposed the idea of continental drift? Alfred Wegener
what is the name of the supercontinent that existed 200 million years ago? pangea
which type of plate boundry involves two plates moving apart? Divergent boundry
which type of plate boundry involves two plates toward one another? convergent boundry
which type of plate boundry involves two plates sliding past eachother ,opposite directions? transform boundry
what is plate tectonics? a theory a about the movement of the plates that cover the earth;s surface.
what is the thinnest layer of the earth? crust
which layer of the earth is made mostly form solid iron and nickel? inner core
which is the thickest layer of the earth? mantle
which layer is made of hot viscous rock ? mantle
where does the convection current take place? asthenoshere / mantle
how do scientists know about the structure of the earth;s interior? scientists study earthquakes.by measuring changes in the speed of seismic waves that travel through earth's interior ,seismologists have learned that the earth is made of different layers.
what keeps the convection current moving? the heat from the core
which boundry is responsible for seafloor spreading? divergent boundry
what is an earthquake? a sudden movement of the earth's surface.
what is the focus? the point where an earthquake starts.
what is the epicenter? the point at the ground level directly above the focus.
The strength of an earthquake is known as the magnitude
what is a richter scale? the scale used to indicate the strength of an earthquake.
how can humans prepare for earthquakes? make sure that the buildings are designed to handle shaking.
Created by: rony
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