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This
collection
of
3D
(anaglyphic)
images
is
derived
from
photography
that
Major
John
Wesley
Powell
commissioned
to
document
his
Second
Expedition
(1871-1872)
and
later
expeditions
on
the
Colorado
Plateau.
Now-famous
localities
such
as
the
Green
River,
Flaming
Gorge,
Dinosaur
National
Monument,
Glen
Canyon,
and
the
Grand
Canyon
are
documented.
The
images
were
created
by
modifying
the
original
stereo
...
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This
article
provides
an
overview
of
the
sedimentary
processes
that
occurred
in
the
aftermath
of
the
May
18,
1980
eruption
of
Mount
St.
Helens.
Topics
include
the
vast
quantity
of
easily
erodable
volcanic
deposits,
high
sedimentation
rates
downstream
from
the
volcano,
changes
in
drainage
patterns
caused
by
the
debris
avalanche
that
triggered
the
eruption,
and
some
efforts
to
control
the
downstream
...
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This
article
provides
a
brief
introduction
to
the
processes
of
weathering
and
erosion
in
desert
environments.
Topics
include
the
differences
in
the
way
these
processes
proceed
in
wet
and
arid
environments,
the
role
of
flash
floods
and
debris
flows
in
moving
large
amounts
of
material
very
quickly,
the
influence
of
bedrock
type
on
sediment
characteristics,
and
the
decrease
in
particle
size
with
increasing
...
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This fact sheet provides an overview of the hazards presented by landslides and debris flows, particluarly in wet weather conditions in landslide-prone areas. Topics include a discussion of the characteristics of debris flows, and suggestions for residents who live in steep, hilly terrain which is subject to periodic heavy rains.
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This
on-line
publication
illustrates
the
spatial
history
of
urban
growth
and
corresponding
land
use
change
in
sixteen
areas
around
the
United
States.
It
features
pairs
of
images
of
selected
urban
regions
from
across
the
nation
which
are
intended
to
show
the
transformation
that
these
areas
have
undergone
over
two
decades,
specifically
increases
in
the
extent
of
urban
land.
Each
pair
is
composed
of
...
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This
guide
provides
illustrated
descriptions
of
46
common
and
important
varieties
of
igneous,
sedimentary,
and
metamorphic
rock
found
in
the
San
Francisco
Bay
region.
Rock
types
are
described
in
context
of
their
identification
qualities,
how
they
form,
and
where
they
occur.
The
guide
also
provides
a
discussion
of
regional
geology,
plate
tectonics,
the
rock
cycle,
the
significance
of
the
selected
rock
...
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This
report
contains
true
stories
that
illustrate
how
to
survive
(and
how
not
to
survive)
a
tsunami.
It
is
meant
for
people
who
live,
work,
or
play
along
coasts
that
tsunamis
may
strike.
The
stories
are
personal
accounts
selected
from
interviews
with
people
who
survived
a
Pacific
Ocean
tsunami
generated
by
the
magnitude
9.5
earthquake
that
occurred
along
the
coast
of
Chile
on
May
22,
1960.
Important
...
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This fact sheet provides an overview of basic scientific facts about landslides. Topics include the different types of landslides, ways that they might be triggered, and how to lessen the effects of landslides on people and structures. A set of links to additional information and some suggested publications are provided. A downloadable, printable version is also available.
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This resource provides an overview of the distribution and occurence of water on Earth. Topics include where and how much water there is, the water cycle, and how water is measured. There is also discussion of characteristics and distribution of surface water, groundwater, glaciers, and icecaps.
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This
report
provides
an
overview
of
the
supply
and
uses
of
groundwater
in
the
United
States.
Topics
include
general
facts
and
concepts;
the
groundwater
budget
and
its
response
to
pumping;
effects
of
groundwater
development
on
surface
water
bodies
and
on
storage;
water
quality
factors;
and
sustainability
of
supplies.
The
report
is
available
in
a
downloadable,
printable
version
and
can
be
ordered
as
...
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