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F E M A
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S
E I S M I C
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L E U T H S
2.2
VOCABULARY
Paleomagnetism:
the
natural magnetic traces
that reveal the intensity
and direction of Earth’s
RA T I ONA L E
To understand earthquakes students need to understand the structure
of the Earth. The theory of plate tectonics has contributed to an
understanding of how the Earth’s plates move and how that movement
can cause earthquakes.
F OCU S QU E S T I ON S
How does the shape of the continents indicate that they were once
joined?
What are some of the ways to tell the continents are moving?
OB J E C T I V E S
Students will:
1. Model magnetic reversal patterns.
2. Use paleomagnetic data to demonstrate plate motion.
MA T E R I A L S
Q
Master 2.2a, Tectonics Background
Q
Transparency of Master 2.2b, Earth Cross Section
Q
Overhead projector
Q
Master 2.2c, Reading the Patterns
Q
Master 2.2d, Continental Pieces, two copies for each small group
Q
Master 2.2e, World Map Grid
Q
Master 2.2f, World Map Grid, 120 MYA
Q
Classroom world map
for each small group
Q
Bar or cow magnet
Q
Large nail
Q
Paper clips or staples
Q
Clamp with a handle
magnetic field in the geologic past.
