Plate Tectonics

1
Plate Tectonics

By Mildred
2
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
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What kind of geological feature is usually
located where two oceanic plates converge?
A trench
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The Hawaiian Islands chain was formed as the
pacific plate moved over a.....
Hot Spot
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Along which kind of boundary is new sea floor
being added?
A divergent boundary
7
What kind of boundary exists along the California
coast?
A transform boundary
8
At what depth in the earth is the interface
between the asthenosphere and the stiffer mantle?
About 600-700 km
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What is the probable composition of the inner
core?
Iron and nickel
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What is the pressure at a depth of 3600 km in the
earth?
2 million atmospheres
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DAILY DOUBLE
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About how thick is the earth's outer core?
About 2200 km
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What is the melting point of the rock at a depth
of 1000 km?
4000 - 4100 degrees C
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How long will it take P waves to travel to a
seismic station that is 4000 km from the
epicenter?
7 minutes
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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
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A seismic station is 7000 km from an epicenter.
How long after P waves arrive will S waves arrive?
8 minutes 40 seconds
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P waves arrive at a seismic station at 12200. S
waves from the same earthquake arrive at 12620.
What is the distance from the epicenter to the
seismic station?
2800 km
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The difference in arrival times between P and S
waves is 9 minutes. If the P waves arrived at
45600, what time did the quake occur?
44600
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What term describes the process by which one
plate dives beneath another?
Subduction
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What kind of rock makes up most of the contenents?
Granite
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As distance from a mid-ocean ridge increases, the
age of the sea floor
Increases
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What force causes the plates to drift?
Convection currents in the mantle.
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Where are earthquakes and volcanoes most likely
to be found?
Along plate boundaries
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What kind of rock makes up most of the sea floor?
Basalt
25
The study of the magnetic properties of ancient
rocks is called
Paleomagnetism
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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.
27
What geographic feature is likely to be found in
regions where two continental plates collide?
A mountain range
28
What term describes a region on the earth's
surface that receives neither P nor S waves from
a particular earthquake?
A shadow zone