Other Chapters' Lyrics:
Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3
Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3
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Earth Science Chapter 8
·
Seismology is the study of
earthquakes.
·
Earthquakes occur mostly at the
edges of tectonic plates, giant masses of solid rock that cover the earth.
·
Faults, which are breaks in the
Earth’s crust, are especially present at tectonic plate boundaries.
·
Rocks stretch and squeeze like
a spring during an earthquake, which causes seismic waves.
·
Seismic waves inside the Earth
are body waves, and seismic waves on the Earth’s surface are surface
waves. Surface waves are more
destructive.
·
Seismographs help to locate
earthquakes, determine when they occurred, and measure their strength.
·
The Richter scale is used to
measure earthquake strength. A one point
increase on the scale indicates a 31.7 times increase in energy release.
·
On the Richter scale, a
magnitude of 2.0 is small and can’t be felt by humans. A magnitude of 4.0 can be felt by most in the
area. A magnitude of 6.0 causes
widespread damage, and a magnitude of 7.0 causes the greatest damage.
·
Buildings are often constructed
to resist earthquakes. Flexible pipes
prevent water and gas lines from breaking.
Base isolators use steel and rubber to absorb shock.
·
In the event of an earthquake,
the best thing to do is lie or crouch under cover in the center of the
room. If you’re in a car outside, remain
in the car.
·
Seismographs left on the moon
have detected moonquakes.
·
Sunquakes are caused by solar
flares, powerful magnetic disturbances in the sun.