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geology
F4 earth structure and global tectonics
ocean crust
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Cards (6)
layers in the ocean crust
A)
sediments
B)
basaltic lavas
C)
basaltic dykes
D)
gabbro
E)
peridotite
5
Lizard peninsula
is an ophiolite.
Profiles
of the earths
crust
can be determined by ophiolite suites.
All
ocean
crust is assumed to have this structure, because all
ocean
crust is formed from
mid ocean ridges.
Layered
seismic velocity is very
similar
in all ocean basins.
Along some slower spreading
MOR
altered peridotites are found by researches
dredging
the sea floor.
Serpentine
is peridotite with
olivine
that has reacted with ocean
water.
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