Plate tectonics vocabulary
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crust
mantle
core
lithosphere
asthenosphere
mesosphere
tectonic plate
continental drift
sea-floor spreading
plate tectonics
convergent boundary
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divergent boundary
transform boundary
compression tension
folding
fault
uplift
subsidence
rift zone
Inside the Earth….
Textbook page 393
The crust
textbook page 392
The Physical structure of Earth
textbook pages 394-395
tectonic plates – pieces of
the lithosphere that move
around on top of the
asthenosphere
Textbook page 396
How do we know the Earth’s interior
consistency????
Textbook page 398
seismic waves – vibrations
caused by earthquakes
Seismologists use readings
from seismographs to
calculate the density and
thickness of each layer of
the Earth.
Intro. to Earthquakes by
Frank Gregario
• continental drift –
hypothesis that the
continents once formed
a single landmass,
broke up, and drifted to
their present locations.
•
Textbook page 401
Textbook page 402
magnetic reversals and
sea-floor spreading
textbook page 403
sea-floor spreading – process by which
new oceanic lithosphere forms as
magma rises toward the surface and
solidifies
molten rock contains magnetic
materials.
magnetic materials align with the
magnetic field of the Earth.
molten rock cools and these materials
are set in their direction.
Earth’s magnetic field reverses
magnetic materials align with the
magnetic field of the Earth
molten rock cools and these materials
are set in this new direction.
The Theory of Plate Tectonics
textbook pages 404-405