Ring of Fire Science

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Pressing Layers

Activity 13

Notes on the activity (Mini-lesson)

Rivers carry sand and silt into the ocean basins around the world. The sediment forms layers on the ocean floor. Over time the layers increase in depth. Some of the layers in the ocean are over 30 km deep. In this activity, students will be compressing bread to see how the sediments in the ocean compress as layers form on top. (Please note this is the mini-lesson for PreK-2nd grade students that the teacher introduces at the beginning of the lesson. When the activity is completed the teacher asks the students what happens to layers in the ocean when new layers form on top of the old sediment.)

Materials

•   Old inner tube

•     Wood blocks 1 ¾ in x 1 ½ in (40 mm x 35 mm)

•    Contact cement

•     Pencil

•    Scissors

•    Pictures of dinosaur tracks

 Directions

1. Find several prints of dinosaur tracks.

2. Draw several tracks on a piece of paper.

3. Draw around one our your wooden blocks. (You will then know how big to make your footprints.)

4. Draw a footprint that is smaller than one of your wooden blocks.

5. Cut out your footprint and place it one the inside of a piece of old inner tube.

6. Draw around your paper footprint with a pencil on the piece of inner tube.

7. Cut out the footprint with a pair of scissors.

8. Glue the footprint to the wooden block with contact cement. (Be sure and follow the manufacturer's directions on applying the glue.

9. Create several more rubber stamp footprints.

10. You can use a stamp pad to ink your print.

11. Press the rubber stamp immediately on some paper to make a footprint.

12. If you do not have a stamp pad, you can paint on your footprint with acrylic paint and then make a footprint while the paint is wet.

Extending the activity

•   Make some dinosaur stationary with your stamps.

•   Make a series of tracks where one dinosaur is following another dinosaur.

Notes and drawings

PreK - 2nd Grade Books   Grades 3 - 6 Books    Grades 6 - 12 Books

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