1. Did Pangaea really exist? Click here for Pangaea model

2. Now turn to page 226 in your Science textbook With a partner, find the highlighted words in Section 8.4 and try to define them. You can always use the glossary in the textbook.

3. What new evidence did scientists find by mapping the ocean floor? -ocean floor not as flat as they thought -there is an underwater mountain range and the trenches run parallel to the ocean edge Mid-ocean ridge

4. What new evidence did scientists find by studying the rocks on the ocean floor? -ocean floor was not as old as they thought -young rocks were at the top of the mid-ocean ridge -the farther away from the ridge, the older the rocks

5. What new evidence did scientists find by studying Earth’s magnetic fields? - there are magnetic reversals in parallel strips of rock as you move further away from the mid-ocean ridge

6. What new evidence did scientists find by studying the locations of earthquakes and volcanoes? - the pattern of volcanoes & earthquakes helped to understand that Earth consists of plates that are continually moving Video on underwater volcanoes

7. What question about plate movement are scientists still working on? Video- The Early Earth and Plate Tectonics

8. Now turn to the volcano plotting lab!