Transcript Plate Tectonics

By Mildred
Jeopardy
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Tectonics 1
Tectonics 2
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What kind of boundary exists
between the Pacific and
Indian-Australian plates?
A convergent boundary
What kind of geological feature
is usually located where two
oceanic plates converge?
A trench
The Hawaiian Islands chain was
formed as the pacific plate moved
over a.....
Hot Spot
Along which kind of boundary
is new sea floor being added?
A divergent boundary
What kind of boundary exists
along the California coast?
A transform boundary
At what depth in the earth is
the interface between the
asthenosphere and the stiffer
mantle?
About 600-700 km
What is the probable
composition of the inner core?
Iron and nickel
What is the pressure at a depth
of 3600 km in the earth?
2 million atmospheres
DAILY
DOUBLE
About how thick is the earth's
outer core?
About 2200 km
What is the melting point of
the rock at a depth of 1000 km?
4000 - 4100 degrees C
How long will it take P waves
to travel to a seismic station
that is 4000 km from the
epicenter?
7 minutes
It takes S waves 13 minutes to
travel from an epicenter to a
seismic station. How long will
it take P waves to reach the
same station?
7 minutes 20 seconds
A seismic station is 7000 km
from an epicenter. How long
after P waves arrive will S
waves arrive?
8 minutes 40 seconds
P waves arrive at a seismic
station at 1:22:00. S waves
from the same earthquake
arrive at 1:26:20. What is the
distance from the epicenter to
the seismic station?
2800 km
The difference in arrival times
between P and S waves is 9
minutes. If the P waves arrived
at 4:56:00, what time did the
quake occur?
4:46:00
What term describes the
process by which one plate
dives beneath another?
Subduction
What kind of rock makes up
most of the contenents?
Granite
As distance from a mid-ocean
ridge increases, the age of the
sea floor
Increases
What force causes the plates to
drift?
Convection currents in the
mantle.
Where are earthquakes and
volcanoes most likely to be
found?
Along plate boundaries
What kind of rock makes up
most of the sea floor?
Basalt
The study of the magnetic
properties of ancient rocks is
called
Paleomagnetism
Why might a seismic station
receive P waves but no S
waves from a particular
earthquake?
The S waves could not pass
through the liquid outer
core.
What geographic feature is
likely to be found in regions
where two continental plates
collide?
A mountain range
What term describes a region
on the earth's surface that
receives neither P nor S waves
from a particular earthquake?
A shadow zone