Transcript Grand Canyon Rocks

Grand Canyon
Rocks
Investigation 3
Earth History
Grade 6
Samples
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Geologists take rock samples (small,
representative pieces) to gather
information about the rock’s location and
to draw where the samples were located.
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Geologists write detailed descriptions of
the rock samples in their field journals.
Sedimentary Rocks
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Sedimentary rocks
are rocks that form in
layers when
sediments are
cemented together.
Examples: Limestone
and Sandstone
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Layers

Flat deposits of rock.
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Layers can be thick or
thin, but they always
extend over a large
area.
Examples: Cakes,
paint, peanut butter.
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Correlation
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Correlate is a word
that means to find a
relationship or
connection between
rock layers from two
or more locations.
Geologists make
connections about
rocks using
correlation.
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Plateau
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A large, nearly level
area of land that has
been uplifted or
elevated above the
surrounding area.
Example: Colorado
Plateau
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Rock Column

The sequence of rocks.
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The top layer in each
column is exposed at the
surface.
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Geologists use rock
columns to show the
sequence of rocks that
they see in a particular
area.
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Formation
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A rock layer
composed of more
than one kind of rock,
but that the sequence
of rocks can be
recognized from one
place to another.
Examples: Kaibab
Formation and
Moenkopi Formation.
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Elevation
The
vertical distance
measured above sea level.
Differential Erosion
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Occurs where a mountain
or a plateau is made out
of both soft, weak rocks
(example: slate) and
harder, more resistant
rocks (example:
Sandstone or Limestone).
The weaker rocks wear
away faster, leaving
behind knobs and cliffs of
more resistant rocks.
Landforms shaped like
steps or cliffs and slopes
are formed by the
process of differential
FOSS Web Multimedia

Please visit the FOSS Website.
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Go to Earth History
User Name: Ms. Walsh
Password: sciencerocks
Click “Enter the Program” and “Continue”
Go to the “Geology Lab” and go to “Earth Processes”
View examples of Erosion and Deposition.
Please click on the link below to begin your
exploration:
 http://www.fossweb.com/