Transcript Exciting Earthquakes By: Erica Cline This is Rocky! He will be going

Exciting
Earthquakes
BY: ERICA CLINE
This is Rocky! He will be going along with you
as you learn all kinds of exciting facts about
earthquakes.
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Click on the star to start learning!
An earthquake is a vibration of the earth’s
surface.
Earthquakes are
common in California
because it is located on
the San Andreas Fault.
California has thousands
of earthquakes every
year. Some so small they
aren’t even felt.
The first recorded
earthquake in
California was felt in
1769. One of the worst
earthquakes California
has seen was on April
18, 1906 in San
Francisco. It killed
3,000 people and cost
$524 million in
damages.
WHY?
Why do you think the earthquake in 1906
cost $524 million in damages?
Answer!
THINK!
If you had been alive in 1906, how would
your family have been affected by the
devastating earthquake?
Answer!
Why do earthquakes happen?
Click the second star to find out!
A fault is a thin zone of crushed rock
separating blocks of the earth’s crust.
HOW?
How did the last video make you feel?
Why?
Answer!
Earthquakes are caused when rocks
underground suddenly break a long a fault
causing a sudden release of energy.
The rocks are constantly
rubbing against each
other. Sometimes the
rocks will stick to one
another causing a build
up of pressure. This build
up of pressure causes
the rocks to break.
How are earthquakes recorded?
Click on the third star to learn!
Have you ever heard of a
seismograph? What d you think
they do?
Answer!
An earthquake’s time,
location, and
magnitude can all be
determined with a
seismograph.
A seismograph is an
instrument that
measures the motions
of the ground. The first
seismograph was
created around 132
A.D.
Video!
Now click on the final star!
1) Why do earthquakes happen?
A. Volcanoes
erupt causing earthquakes.
B. Underground
earthquakes.
C. Earthquakes
rocks break causing
are caused by people.
Correct!
You’re right! B is the correct answer
because earthquakes happen due to
underground rocks that break.
Incorrect
A is not the correct answer. Please go back
and try again.
Incorrect
C is not the correct answer. Please go back
and try again.
2) What is an earthquake?
A)A
vibration of the earth’s surface.
B) A
storm.
C)A
thin zone of crushed rock.
Correct!
You’re right! A is the correct answer
because an earthquake is a vibration of the
earth’s surface.
Incorrect
B is not the correct answer. Please go back
and try again.
Incorrect
C is not the correct answer. Please go back
and try again.
3) When was the first seismograph created?
A)1769
B) 2014
C)132
A. D.
Correct!
You’re right! C is the correct answer
because the first seismograph was created
in 132 A.D.
Incorrect
A is not the correct answer. Please go back
and try again.
Incorrect
B is not the correct answer. Please go back
and try again.
4) True or False: A fault is a thin zone of
crushed rock separating blocks of the
earth’s crust.
Correct!
You’re right! True is the correct answer
because a fault is a thin zone of crushed
rock separating blocks of the earth’s crust.
Incorrect
True is the correct answer because a fault is
a thin zone of crushed rock separating
blocks of the earth’s crust.
5) What all can be measured using
a seismograph?
A)Time
B) Location
C)Magnitude
D)All
of the above
Correct!
You’re right! D is the correct answer
because seismographs can measure an
earthquake’s time, location, and
magnitude.
Incorrect
A is not the correct answer. Please go back
and try again.
Incorrect
B is not the correct answer. Please go back
and try again.
Incorrect
C is not the correct answer. Please go back
and try again.
What is an earthquake? Why do
earthquakes happen?
Answer!
Congratulations!
Congratulations! You have now learned all
about earthquakes and how exciting they
can be!