chapter 25 Flashcards
Hess discovered the system of mountains ranges on the seafloor separated by valleys, which he called
mid-ocean ridge
A long, narrow depression called a … forms in between peaks along the mid-ocean ridge.
rift valley
the boundary where two plates collided is called
convergent plate boundary
when a thick and buoyant continental plate meets a thin a dens oceanic plate, denser plate dives beneath the continent in in process called
Subduction
the boundary between two plates that are moving apart is called
divergent plate boundary
this type of boundary where plates slides horizontally past each other in opposite directions is called
transform plate boundary
is the sudden movement or vibration of the ground that occurs when rocks slip and slips and slides along enormous cracks in the earths crust.
earthquake
a… is a crack in earths crust along which rock has moved
fault
this sudden release of strain energy as rock moves along a fault is called
elastic rebound
the point of origin for an earthquake is called a
focus
the point on Earths surface directly above the focus is called the
epicenter
how divergent plate boundaries
they come apart
what are two examples of divergent plate boundaries
mid ocean ridge (made oceanic crust)
East African rift (made up of two continental crusts)
how do transform plates Boundaries
they slide by each other
what is a specific example of a transform plate boundary
San andreas fault(two continental crusts
how do convenience currents work
it heats up becomes less dense the rises
magma cools becomes more dense and goes down
what are the other forces the helps with plate moment
slab pull
Ridge pushes
friction y7
what two types of boundaries have shallow earthquakes
Divergent and trancfrom
what two types of boundaries have shallow earthquakes
Divergent and trancfrom
which boundary has deep earthquake
convergent
what are the types of stress the could be applied to rocks
compression
a tension
a shear
torsion
what are the two types of deformation
plastic and elastic
what happens to a rock to a rock when when alas tic deformation happens
it renters to og shape
what happens to a rock during plastic deformation happens
it deforms and stays in that shape
what are seismic waves
primary
Secretary
surface
witch type of seismic waves moves the fastest
primary
how do primary waves move
there compression waves
what type of materials do primary waves move throw
solids and liquids
how secondary waves do waves move
they are transverse waves
what type of meterail does secondary waves move throw
only solids
witch types of waves is most complex and can do the most damage
surface waves
what are the two scales used to help to measure earthquakes
richer scale
Mercalli scale
what does the Richter scale tell us about earthquakes
amount of energy released
