natural disasters

20 cards

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Created Sep 17, 2012
by
elissaolivas

 

 
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1
the earths crust is composed primarily of...
 
aluminum- rich silicate
2
plate tectonics is driven by energy from...
 
the earths internal heat
3
which zone of the earths interior is liquid?
 
outer core
4
the rigid tectonic plates move over the upper mantle (asthenosphere) which is..
 
semi-molten
5
which part of the earth is LEAST dense?
 
continental crust
6
the earths magnetic field is the result of..
 
movements in the inner and outer core
7
the earth's tectonic plates move toward each other at..
 
convergent boundaries
8
hit mantle rises toward the surface at
 
mid-ocean ridges
9
at subduction zones
 
the ocean crust is melted and destroyed 
10
continents are higher than the ocean floor because
 
continental crust is lighter and thicker than ocean crust
11
in elastic deformation a solid will
 
return to its original shape when stress removed
12
the energy released during an earthquake was stored previously in
 
elastic strain 
13
a fault formed by tensional stress is called a 
 
normal fault
14
which of the following describes seismic S waves?
 
shearing (sideways) motion
15
the first seismic waves to reach a distant recording instrument are
 
P waves
16
which seismic waves have a rolling (or circular) ground motion
 
Rayleigh waves
17
the time interval between the arrival of P and S waves can determine the 
 
distance to the epicenter
18
to determine the location of the epicenter of an earthquake you must have records from a minimum...
 
three seismograph locations
19
which is used to determine an earthquake's richter magnitude?
 
seismic wave height 
20
which measure of earthquake strength is useful for studying the history of earthquake before...
 
intensity 

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