Folds and Faults
Procedures
1. You will be building some mountains made up of sedimentary
layers.
a. Roll each color of play dough, forming a flattened pancake
about 15 cm. (or 6 inches) in diameter and 1 cm (or 1/3 inch)
thick. The greater the diameter and the thinner the layers, the
more easily the model can be folded.
b. Stack the layers on top of each other. It doesn't matter in which
order the colors are stacked.
c. Observe the layers from the side; the layers should look flat.
d. Draw a side view of this model of unfolded layers in their
Mountain Building Journal on page 7.
2. Now, we will simulate compression: Place your hands, one on
either end of the play dough layers so that they can squeeze it
along its longer axis. Gently push your hands together causing
the play dough layers to fold and buckle. Try to make at least one
upward fold (anticline) and one downward fold (syncline).
a. What might cause similar compression to occur to the earth's
crust?
b. Where might that occur?
c. Draw the folded model on page 7 of their journals.
3. Cut the top off of your folded mountains to model surface erosion,
discuss what you observe, and draw and label what you see on
page 7 in your journals.
4. Try cutting your mountain any way you choose (as long as it is
different than the views you already have). You should draw and
label what you see on page 8 in your journal.
5. Look at the images of the Folded Rocks Photos . How do these
images compare to your models.
6. Complete the Review and Reflection questions on page 8 in your
journals.

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