plate tectonics
what are the three main types of boundaries?
divergent, convergent and transform
why do earthquakes happen?
earthquakes happen when plates overcome friction and move elastic rebound theory
how do volcanoes form?
forms in an opening in the earth's crust through which magma erupts.
where is the core located?
beneath the mantle, made up metal like iron
what is pyrococlastic flow?
current of superheated volcanic ash, lava, and gas that flows from a volcano
what are the three types of convergent boundaries?
continental-oceanic, continental-continental, and oceanic-oceanic
what is the focus?
a point on the fault of which the first movement occurs
what differences do the types of magma have?
mafic- thin, darker and fast moving
felsic- thick and light-colored
what makes the mantle a chemical layer?
it is made up of rocks with the elements of silicon, oxygen, and heavier elements like magnesium and iron
what is the thickest part of the earth's interior?
mantle
which plate boundary is two plates crape past each other ?
transform
how do scientist measure seismic waves?
richter scales and seismographs
where does subduction boundaries occur
subduction zones
what are the different layers in earth's interior?
crust, mantle, inner core and outer core
what is earth's interior?
the earth is divided into three main layers. composed of four layers, three solids and one liquid not magma but molten metal, nearly as hot as the surface of the sun
what is convection currents and the causes?
a cycle of hot material rising, cool material sinking
causes the plates to move
which wave can move through solid and liquid ?
p waves which is primary
what is lahar mud flows?
mixture of water, rock fragments and sediment that flow down the slopes of a volcano
what are the five physical layers ?
lithosphere, asthenosphere, mesosphere, inner core and outer core
true or false. earthquakes cause tsunamis to occur?
true
in what plate boundary do subduction zones occur?
continental-oceanic
what does seismic waves do?
they radiate outward in all directions
what boundary type does hot spot go in?
areas of volcanic activity
what are the two types of crust?
continental crust and oceanic crust
true or false. epicenter is the first movement to occur?
false