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This
time
scale
allows
students
to
select
multiple
time
periods
from
a
list
and
view
them
on
a
highlighted
display.
It
shows
the
relationship
between
eon,
era,
period,
sub-period,
and
epoch
and
also
includes
the
date
in
mega-annum
(Ma)
or
millions
of
years
before
present.
The
scale
reflects
the
changes
in
the
Cenozoic
Era
(Tertiary
and
Quaternary
have
been
eliminated
and
the
Neogene
modified)
in
the
...
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Choosing & Using this resource...
Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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The rings on a tree tell a tale - each ring holds clues about that particular year. This radio broadcast reports on an archaeologist who is using the rings to date events in ancient history. This method produces an unconventional date for the Thera volcano eruption, which may cause a rewriting of Mediterranean history. The clip is 2 minutes in length.
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This
broadcast
describes
the
four
great
Eons
of
history:
the
Hadean,
the
Archean,
the
Proterozoic
and
the
Phanerozoic.
Together,
they
encompass
four
and
a
half
billion
years.
How
can
we
begin
to
make
sense
of
such
a
huge
swathe
of
time?
And
can
we
be
sure
that
we
have
got
the
age
of
the
Earth
right?
Geologists
use
Eras,
Periods
and
Epochs
to
further
punctuate
what
is
known
as
Deep
Time,
but
can
we
...
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This
is
the
geological
time
scale
developed
by
the
British
Geological
Survey.
The
principal
chart
is
the
Phanerozoic
(Cambrian
to
Quaternary)
timescale.
The
names
of
the
individual
periods
are
live
links,
each
one
leading
to
a
chart
showing
the
subdivisions
of
each
period
into
epochs
and
ages.
The
Proterozoic
and
Neoproterozoic
sections
are
also
linked
to
further
subdivisions
into
eras
and
periods.
...
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In
this
activity
students
convert
major
events
in
Earth
history
from
years
before
present
into
scale
distances.
After
a
list
of
events
and
their
scale
distances
have
been
formulated,
students
construct
a
geologic
time
scale
on
5
meters
of
adding
machine
paper,
beginning
with
the
formation
of
the
Earth.
Students
will
investigate
change
through
geologic
time;
design,
construct
and
interpret
a
model
...
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Choosing & Using this resource...
Educational standards associated with this resource:
National Science Education Standards (NSES), National Geography Standards: Read
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This
exercise
can
be
used
to
demonstrate
changes
in
the
Earth
through
time,
and
the
length
of
time
it
took
for
those
changes
to
take
place.
A
list
of
Important
Dates
in
Earth
History
is
provided
that
contains
the
dates
of
the
events
shown
on
a
time
clock.
The
teacher
can
pick
events
from
the
list
of
key
events
and
calculate
(or
have
students
calculate)
the
time
for
the
key
events
they
wish
to
use.
...
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Choosing & Using this resource...
Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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This
text
assists
in
understanding
time
relationships
and
how
life
on
Earth
has
changed
over
time.
The
dates
shown
were
compiled
from
several
available
sources.
The
first
page
shows
some
important
events
in
Earth
history,
presented
in
the
order
in
which
they
occurred.
The
data
are
also
shown
on
the
scale
of
a
calendar
year.
On
the
second
sheet
is
a
chart
showing
the
geologic
eras,
systems,
and
series.
...
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Choosing & Using this resource...
Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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This
outdoor
exercise
shows
students
the
great
expanse
of
time
that
has
elapsed
between
the
formation
of
Earth
and
the
emergence
of
living
creatures,
particularly
humans.
The
great
length
of
the
football
field
helps
reinforce
the
idea
of
the
vast
amounts
of
time
that
have
passed.
Starting
on
one
goal
line,
they
will
mark
off
distances
representing
the
times
of
various
events,
rocks,
fossils,
or
geologic
...
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Choosing & Using this resource...
Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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This
page
examines
the
issues
involved
in
teaching
students
about
the
geologic
time
scale.
There
are
suggestions
for
tackling
troublesome
issues
in
class
as
well
as
activities
that
can
be
used
to
clarify
how
geoscientists
look
at
deep
time.
Five
main
concepts
with
which
students
struggle
when
thinking
about
Deep
Time
are
addressed
here:
imagining
or
comprehending
big
numbers;
the
difference
between
...
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This
Flash
animation
provides
a
tour
of
the
history
of
the
universe,
the
solar
system,
and
Earth.
Moving
the
slider
allows
viewers
to
progress
from
the
Big
Bang,
almost
14
billion
years
ago,
to
the
beginnings
of
life
on
Earth
in
the
Proterozoic
era,
through
the
age
of
the
dinosaurs
and
finally
to
the
time
of
Homo
sapiens.
When
the
slider
stops
moving,
animations
and
text
appear,
highlighting
important
...
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