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Unusually
high
incidences
of
asbestos-related
mortality
and
respiratory
disease
in
the
town
of
Libby,
Montana,
have
been
linked
to
amphibole
mineral
fibers
intergrown
with
the
vermiculite
deposits
mined
and
milled
near
the
town
from
1923
to
1990.
Prompted
by
this
discovery,
the
U.S.
Geological
Survey
undertook
an
investigation
of
the
mineral
content
of
other
U.S.
vermiculite
deposits
to
determine
...
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The definition of asbestos often varies depending on the source or publication in which it is used. This report summarizes asbestos-related definitions taken from a variety of academic, industrial, and regulatory sources. This summary is by no means complete but includes the majority of significant definitions currently applied in the discipline.
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A part of the United States Geological Survey Coastal and Marine Geology (USGS CMG) Program, this site has a 72 second video clip taken from video 6 (Plate Dynamics) of the 'Earth Revealed' geocscience series produced by Annenberg/
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This animation, listed as 2.10 in Chapter Two in the Essentials of Geology web page, shows how hot spot volcanoes arise. Users may access this and many other animations describing plate tectonic processes from the Chapter Two webpage. Users may also follow links to other chapters in the Essentials of Geology book.
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This website, designed for a Sediments and Strata course at the University of California- Davis, contains numerous photographs of turbidite sequences in outcrop. Photos are divided into two categories; turbidites in the Cretaceous Pigeon Point Formation and turbidites in the Cretaceous Great Valley Sequence. Users may also follow a link to other sedimentary photos.
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This
resource
for
students
offers
review
materials
to
supplement
discussions
of
the
text
Earth:
Portrait
of
a
Planet.
A
series
of
original
animations
helps
students
to
visualize
dynamic
Earth
processes,
with
an
emphasis
on
plate
tectonics,
geologic
hazards,
and
earth
systems
science
concepts.
Additional
materials
include
overviews,
key
terms
and
definitions,
crossword
puzzles,
and
multiple-choice
...
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This
resource
offers
students
review
materials
to
supplement
the
text
Physical
Geology.
Book-specific
quizzes,
case
studies,
objectives,
animations,
and
web-links
enhance
and
test
students'
understanding
of
chapter
concepts.
Additional
features
include
Virtual
Vistas,
where
images
created
from
geospatial
data
sets
accompany
brief
descriptions
of
interesting
or
unique
geologic
settings,
and
interactive
...
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This resource contains :
Animations of Geologic Structures -
http:/
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Part
of
the
supporting
resources
for
the
School
of
Earth
Sciences
dynamic
earth
module,
the
-Why
Topography?-
site
discusses
two
models
introduced
in
the
19th
century
that
are
still
used
to
explain
topographic
variations.
These
models
are
the
Pratt
and
Airy
models
of
isostasy.
In
the
Pratt
model,
high
topography
(relative
to
surroundings)
is
due
to
lower
density
whereas
in
the
Airy
model,
high
topography
...
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These
lecture
notes
discuss
the
role
of
buoyancy,
flexure,
and
erosion
in
the
earth's
topography
and
the
lifetime
of
mountain
ranges.
It
recalls
Pascal's
law
that
pressure
of
a
material
overlying
a
fluid
is
equal
everywhere
at
a
given
depth
and
Archimedes'
principle
that
a
body
in
a
fluid
is
buoyed
up
with
a
force
equal
to
the
weight
(mass
x
volume)
of
the
displaced
fluid.
Continents
are
buoyant
crust
...
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This
interactive
Flash
animation
of
a
dune
triangle
allows
users
to
click
on
a
dune
type
and
see
a
related
image
with
accompanying
descriptive
text.
The
three
parameters
of
the
dune
type
triangle
are
sand,
wind,
and
vegetation.
The
demonstrated
dune
types
are
longitudal,
crescent
(barchan),
transverse,
star,
and
parabolic.
This
visualization
is
from
Chapter
19
(The
Work
of
Waves
and
Wind)
of
the
animations
...
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