Plate Tectonics Review 1

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Across
  1. 4. Relative dating principle that states younger rock layers form on top of older rock layers
  2. 5. Differences in temperature causing movement of fluid as heat transfers to cooler areas. Contributes to plate movement on Earth's surface.
  3. 6. The volcanoes surrounding the Pacific Ocean. Also, where most volcanic/earthquake activity is found.
  4. 7. The theory that states that Earth's outer shell is divided into several plates that move over the Earth's mantle
  5. 8. Layers of rock that have fragments of other rock layers is younger
  6. 9. When plates move in opposite directions and away from each other
  7. 10. Any layer that cuts through another layer is younger
Down
  1. 1. When plates come together and collide with each other
  2. 2. Where does the source of material come from to form new tectonic plates?
  3. 3. The theory proposed by Alfred Wegener in 1912 that states continents slowly move across the Earth's surface
  4. 7. When plates rub as they slide past each other