Chocolate Chip Cookie Rock Cycl

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					Chocolate Chip Cookie/Rock Cycle Module                Created by Tania Deisher, September 2005



  Chocolate Chip Cookie / Rock Cycle Module
                                     Materials, Day I:

12 oz bag of chocolate chips (semisweet)             Non-stick baking sheets, greased
           Stove or hot plate                                  Saran wrap
           Non-stick pot, lid                                  Refrigerator
         Several plastic spoons                                  Hot pad

                                     Prep work, Day I:
Before class, melt down 12 oz bag of semisweet chocolate chips on a hot plate or stove.
Allow the chocolate to cool some before bringing the pot into the class (so that they will
solidify faster on the baking sheet, rather than spreading out and making a mess). Place
the covered pot of chocolate on the hot pad in a stable area.

                       In Class Activity, Day I:
QUESTION TO CLASS: Where do rocks come from?

GUIDANCE: Think about what you’ve learned about the core of the earth…
          How is the core of the earth connected to the surface that we walk on?
          (Volcanoes!)
          What happens to lava when it cools?
          What kind of rock comes from a volcano? IGNEOUS
                 - Examples of igneous rocks? pumice, obsidian
                 - Density example with pumice = only rock that floats.

OBJECTIVE: The first type of rock in the rock cycle is igneous rock, which forms when
           lava cools (both above and below the earth’s surface).

ACTIVITY:      Provide each student with their own spoon. Ask them if they have an idea
               what the melted chocolate might represent based on the previous
               discussion. Have each student dip their spoon into the chocolate and make
               a few “igneous rocks” on the greased baking sheet.

       Reiteration: What are the rocks called that form when lava cools?

“HOMEWORK”:            For Thursday, think about the rock dissections…those rocks were
                       made of more than one mineral. If the chocolate chips are one
                       kind of mineral in a chocolate chip cookie rock, what would be
                       some other minerals?

                                     Post-work, Day I:

Cover the baking sheet with saran wrap, label the sheet appropriately (do not eat!) and
leave it in a refrigerator until Thursday. Clean up.


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Chocolate Chip Cookie/Rock Cycle Module                    Created by Tania Deisher, September 2005


                                          Materials, Day II:

            Stack of heavy books                                    ½ stick butter, softened
                   Spatula                                        ½ cup brown sugar, packed
          Measuring cups / spoons                                   ¼ cup granulated sugar
               2 Mixing bowls                                  2 large eggs, at room temperature
               Wooden spoon                                            ½ teaspoon vanilla
       Non-stick baking sheets, greased                            ½ teaspoon baking powder
                                                                    ¼ teaspoon baking soda
     COOKIE RECIPE (makes 2 dozen):                                     ¼ teaspoon salt
            1 1/8 cups Flour                                       “Igneous” chocolate chips

                                          Prep Work, Day II:

Have ingredients and measuring utensils organized. Get “igneous” chocolate out of
refrigerator and scrape off of baking sheet with a spatula into a bowl. Wash baking
sheets well and re-grease.

                                   In Class Activity, Day II:

QUESTION TO CLASS:               Are there other rocks on the earth besides igneous rocks?
                                 Examples?

GUIDANCE: Think about the dissection rocks. Were they made up of the same
          minerals? Our chocolate igneous rocks are made up of one mineral, but
          how is a rock with more than one mineral made?
           The dissection rocks are an example of a SEDIMENTARY ROCK.

QUESTION #2: How do sedimentary rocks form?

Explanation: When igneous rocks are broken off by wind or water, the pieces
             eventually end up in streams. Small pieces of different kinds of rock and
             other material (sand, etc) are called SEDIMENT. Over a long period of
             time (10,000 years or more), layers of sediment end up on top of each
             other.

                Think about a single page in a book. One page isn’t heavy at all but if you
                put all of the pages in 10 heavy books on top of each other, whatever is at
                the bottom of the book stack gets squashed. That is what happens to
                sediment. Have a student volunteer come to the front of the class. Place a
                single page on the student’s hand and ask if it is heavy. Continue to place
                books on top of the student’s hand until they agree that it is heavy. Note
                that it takes hundreds or thousands of pages to be considered “heavy.”

                Eventually there is so much weight on top of the lowest layer that the
                ingredients in the lower layer start to get pressed together. The kinds of
                rocks that form when different minerals are pressed together for a long
                period of time are SEDIMENTARY ROCKS.


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Chocolate Chip Cookie/Rock Cycle Module               Created by Tania Deisher, September 2005


QUESTION #3: If cookie dough represents a sedimentary rock, what are the “minerals”
             (flour, chocolate chips, eggs, sugar, butter, vanilla, etc)?

OBJECTIVE: Sedimentary rocks form from pieces of rock and other materials (sand,
           shells, etc) that are compressed under heavy pressure for a very long time
           and are the second step in the “rock cycle.”

ACTIVITY:      Have students wash hands thoroughly.
               Write the ingredients on the board as students list them off and put the
               appropriate measurement for the recipe next to the ingredient. Add any
               other ingredients not named by students.
               Have the students add the proper amount of each ingredient to the mixing
               bowl (dry in separate bowl than wet ingredients – mix each separately,
               then mix together). Ask for a few volunteers to take turns mixing. What
               does the stirring represent in the context of our cookie dough sedimentary
               rock? (The pressure that brings all of the minerals together.)
               Have the students help make cookie dough balls on the baking sheets.

       Reiteration: What are the rocks that form from different minerals under
                    pressure for a long time called?

“HOMEWORK”:            For Tuesday, think about what changes when we put the cookie
                       dough in the oven. Is it the same? Would a sedimentary rock be
                       the same if you cooked it?

                                     Post work, Day II:

Cover the baking sheets with saran wrap, place in refrigerator. Clean up.




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Chocolate Chip Cookie/Rock Cycle Module                  Created by Tania Deisher, September 2005


                                    Materials, Day III:
           Oven                            Oven mitt                           Napkins
          Timer                             Spatula                             (Milk)
   Cookie dough (Day II)                  Cooling rack                       (Dixie cups)

                                    Prep Work, Day III:
Take cookie dough out of refrigerator with enough time to warm up a bit. Preheat the
oven to 350 °F.

                                In Class Activity, Day III:
QUESTION TO CLASS: If you cook a sedimentary rock is it the same? Why or why
not? If you cool a sedimentary rock is it the same? (The dough was refrigerated…)
   **Ask someone to be a timer. Put the cookie sheet in the oven for 15 minutes. **
       SCIENTIFIC METHOD DISCUSSION (while the cookies cook)
QUESTION #1: Who has heard of the scientific method? What is it? What are the
             steps? List them on the board.
                                 1. Observation:
                                 2. Question:
                                 3. Inference (what you see):
                                 4. Hypothesis:
                                 5. Experiment:
                                 6. Results:
                                 7. Conclusion:
QUESTION TO CLASS:             If I want to use the scientific method regarding what
                               happens to sedimentary rocks when they are cooked, where
                               do I start? Help me fill in the 7 steps…
 **Remove the cookies from the oven and place on cooling rack in front of the class.**
QUESTION #3: What do you see? Are they the same? What changed?
Explanation: Metamorphic rocks form when igneous or sedimentary rocks get super-
             heated (and squashed). The heat cooks the rock and changes it – like
             cookie dough turning into a cookie.

                Once metamorphic rock is formed it can get broken off into pieces by
                wind and water and end up in sedimentary rock again and then a new
                metamorphic rock. This is the idea of the rock cycle (important to note it
                takes a REALLY LONG TIME!).

QUESTION #4: Ask the class to explain the rock cycle to you (reward is cookies!)

                                    Post work, Day III:

Make any notes to improve lesson for future use. Clean up.



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