plate tectonics
the most violent shaking of an earthquake would be a number
10
transform boundary
plates slide/grind past each other
evidence of continental drift
same type of rock scrape
continental drift was found on the continents
south america and africa
the plunging of the ocean floor back into the interior of the earth is called what?
subduction
most of the damage during an earthquake is caused by
surface waves (l waves/raliegh waves)
compared to earths ocianic crust earths continental crust is
thicker and composed of granite
two plates that grid past each other are called
transform boundary
converging plate boundary
PLATES MOVING TOWARD EACH OTHER when two plates carrying continents collide the continental mantle is uplifted
the shaking that results from the sudden movement of the earths crust is called an
earthquake
the study of seismic waves change as they travel through earth has revealed that
earths outer core is liquid because s-waves are not transmitted through this layer
during an earthquake the most violent shaking occurs at the
epicenter
the point between the surface where rocks break and move is an earthquakes
focus
evidence of continental drift
fossil evidence
the layer of the earth with the hottest temp and most intense pressure is called
inner core
ny does not experience many strong earthquakes because
its not along a plate boundary
what is convection?
material in the mantle is heated causes plates to move. (heat rises cools sets)
the youngest rock on the ocean floor are found at
mid ocean ridges
which two features are commonly found at divergent plate boundaries?
mid-ocean ridges and rift valleys
Diverging plate boundary
MOVING APART
what travels faster, P waves or S waves?
P waves
what is sea floor spreading?
divergent plate boundaries formed mid ocean ridges
the convection currents responsible for moving tectonic plates occur in which earth layer?
asthenosphere
which part of the earths interior is inferred to have convection currents that cause tectonic plates to move
asthenosphere
the plates of the lithosphere float on a hot zone of plastic rock called the
asthenosphere (upper mantle)
the youngest rocks are found closest to what?
closest to boundrys
the movement of tectonic plates is inferred by many scientists to be driven by
connvection currents in the asthenosphere
the movement of material caused by differences in temp and density is called
convection
where do trenches form?
convergent boundary
mountains are usually formed at a
converging boundary
subduction occurs at
converging boundary
the least dense layer of the earth is called the
crust
the layer of the earths crust that is liquid is called the
outer core
according to the theory of continental drift the continents were once part of a large land mass called
pangaea
pieces of evidence that support the theory of continental drift
pieces fit together perfectly