VIRTUAL EARTHQUAKE
• http://www.sciencecourseware.org/virtualear
thquake/php/DoRichter3.php
http://www.slideshare.net/cfoltz/eart
h-science-41-inside-the-earth
• http://www.slideshare.net/allsaintsscience/7t
h-grade-ch-1-sec-1-earths-interior
DIVERGENT BOUNDARY
• Boundary between two plates that are
moving apart.
CONVECTION CURRENT
A current in Earth’s mantle that
transfers heat in Earth’s interior and is
the driving force for plate tectonics.
ASTHENOSPHERE
Plastic like layer of
Earth on which the
tectonic plates
float and move
around.
LITHOSPHERE
The rigid layer of Earth
about 100 km thick,
made of the crust and
a part of the upper
mantle.
CONVERGENT BOUNDARY
• Boundary where two plates come
together. They can form mountain
ranges, volcanoes and tranches.
SEAFLOOR SPREADING
• When oceanic
plates separate
and form midocean ridges.
Rising magma
cools and forms
new oceanic crust.
TRANSFORM BOUNDARY
• Formed where
two plates
slide past each
other. They
move in
opposite
directions.
SEISMIC WAVES
• Waves generated
by an earthquake
that travel through
Earth.
MAGNITUDE
• A measure of the energy that is released
from an earthquake.
• Richter magnitude scale
TSUNAMI
• Ocean waves
caused by
earthquakes.
• Seismic sea
waves.
VENT
• An opening
in Earth’s
surface
where
magma is
released.
EPICENTER
• The point on
the Earth’s
surface directly
above the
focus of the
earthquake.
FOCUS
• The point where
the energy release
of the earthquake
first occurs.
• Located about 65
km beneath the
surface of the
Earth.
SEISMOGRAPH
• An instrument that
measures seismic
waves from
earthquakes and
volcanic eruptions.
• They register the
waves and record
the time of the wave
arriving at the
station.
PRIMARY WAVES
• Particles in rock stretch and compress as
energy moves through it.
• The first wave that leaves the focus of the
earthquake.
SECONDARY WAVES
• Particles in rock move in a backward, rolling
motion and a side to side, swaying motion.
• Picture a wave moving through a jump rope.