1. Making a Model Of Sea Floor Spreading You will be able to Identify and Comprehend the features of a moving Sea Floor

2. Directions Part One Each of you needs to get one piece of construction paper Measure 10 inches from the end and cut paper so you have a 10” piece and 8” piece. Keep both pieces! From top and bottom edges measure 1” From left and right edges measure 1 ½ “

3. Making the Sea Floor From top and bottom edges measure 1” From left and right edges measure 1 ½ “ Connect lines to form lines of about 7” in length Carefully puncture paper and cut evenly along this line. DO NOT GO TO EDGE of PAPER Measure 6” from top and 1” from both sides and repeat making an incision of 7”

4. Making Sea Floor Identify the Middle incision as a Mid Ocean Ridge Identify the other incisions as Subduction Zones. You are now ready to make the Magma and Rocks

5. Magma and Rocks With 8” piece measure 4” across from top edge and 4” from bottom edge. Connect line all the way from top to bottom Rotate paper so long sides go “West to East” Make measurements for every inch (should have 12 columns) and connect lines all the way down Cut this piece into 2 6” strips and then align these pieces so that “striped paper” faces each other

6. Making the Sea Floor Move As magma breaks through Crust Iron minerals in rock align themselves to the Earth Magnetic field so draw arrow pointed north on both strips When you see a stripe appear in the magma, the Earth’s magnetic pole switched so draw arrow going down on each strip When a stripe appears again the Earth’s magnetic poles change so flip arrow again. Keep doing so until all the Rock has been identified by these arrows

7. Finishing touches Label the zones of Subduction What features would be found on the land? Draw those features on the LAND sections. Answer the following questions on separate sheet of Paper

8. Questions? Why are the magnetic clues important to understanding how the Earth Plates move over time? Which Ocean do you think this model best represents and why? If this ocean is growing, what ocean must be shrinking in size? What does that tell you about the Earthquakes and Volcanoes found in this region?

9. Big Question It is theorized that it takes just over 200 million years for rocks to make the journey from the Ridge to the Subduction zones. How has that impacted our understanding of life on our planet? (Think…. what us tells about past life forms and where do we think life started?)