If the crust of the earth were not pretty solid, it would be shaking about and moving up and down frequently.
If
the
crust
of
the
earth
were
not
pretty
solid
,
it
would
be
shaking
about
and
moving
up
and
down
frequently
.
However, there are places in the rocks of the earth's crust where it isn't strongly held together--where faults exist.
However
,
there
are
places
in
the
rocks
of
the
earth
's
crust
where
it
is
n't
strongly
held
together
--
where
faults
exist
.
Along the faults, one rock might push against another with great force.
Along
the
faults
,
one
rock
might
push
against
another
with
great
force
.
The energy is changed to vibration in the rocks, so they begin to shake and we have an earthquake!
The
energy
is
changed
to
vibration
in
the
rocks
,
so
they
begin
to
shake
and
we
have
an
earthquake
!
The most famous one in North America was the San Francisco earthquake of 1906.
The
most
famous
one
in
North
America
was
the
San
Francisco
earthquake
of
1906
.
Seven hundred people died and property damage amounted to about $425,000,000.The greatest destruction came from the fires that followed the quake.
Seven
hundred
people
died
and
property
damage
amounted
to
about
$
425,000,000.The
greatest
destruction
came
from
the
fires
that
followed
the
quake
.
One of the most famous earthquakes in Europe took place in Lisbon, Portugal, in 1755.
One
of
the
most
famous
earthquakes
in
Europe
took
place
in
Lisbon
,
Portugal
,
in
1755
.
The city was destroyed and at least thirty thousand people were killed.
The
city
was
destroyed
and
at
least
thirty
thousand
people
were
killed
.
In 1908, in Calabria and Sicily, a quake killed about seventy-five thousand people.
In
1908
,
in
Calabria
and
Sicily
,
a
quake
killed
about
seventy-five
thousand
people
.
In 1915, in central Italy, hundreds of towns and villages were damaged and thirty thousand people were killed.
In
1915
,
in
central
Italy
,
hundreds
of
towns
and
villages
were
damaged
and
thirty
thousand
people
were
killed
.
Two great earthquakes that caused great damage in Asia took place in Tokyo, Japan, and in Gansu Province in China.
Two
great
earthquakes
that
caused
great
damage
in
Asia
took
place
in
Tokyo
,
Japan
,
and
in
Gansu
Province
in
China
.
The Tokyo quake of 1923 killed more than one hundred thousand people and destroyed the city and the city of Yokohama, too.
The
Tokyo
quake
of
1923
killed
more
than
one
hundred
thousand
people
and
destroyed
the
city
and
the
city
of
Yokohama
,
too
.
The Chinese quake in 1920 covered more than three hundred square miles and killed about two hundred thousand people.
The
Chinese
quake
in
1920
covered
more
than
three
hundred
square
miles
and
killed
about
two
hundred
thousand
people
.
If the crust of the earth were not pretty solid, it would be shaking about and moving up and down frequently. However, there are places in the rocks of the earth's crust where it isn't strongly held together--where faults exist. Along the faults, one rock might push against another with great force. The energy is changed to vibration in the rocks, so they begin to shake and we have an earthquake!  The most famous one in North America was the San Francisco earthquake of 1906. Seven hundred people died and property damage amounted to about $425,000,000.The greatest destruction came from the fires that followed the quake.  One of the most famous earthquakes in Europe took place in Lisbon, Portugal, in 1755. The city was destroyed and at least thirty thousand people were killed. In 1908, in Calabria and Sicily, a quake killed about seventy-five thousand people. In 1915, in central Italy, hundreds of towns and villages were damaged and thirty thousand people were killed.  Two great earthquakes that caused great damage in Asia took place in Tokyo, Japan, and in Gansu Province in China. The Tokyo quake of 1923 killed more than one hundred thousand people and destroyed the city and the city of Yokohama, too. The Chinese quake in 1920 covered more than three hundred square miles and killed about two hundred thousand people.