Evidence of seafloor spreading

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Across
  1. 2. What do the Earth's magnetic poles occasionally do, causing rocks to have different magnetic orientations?
  2. 3. What is formed when tectonic plates pull apart and magma solidifies?
  3. 5. What type of plate boundary leads to the formation of oceanic ridges?
  4. 7. Which well-known oceanic ridge runs down the center of the Atlantic Ocean?
Down
  1. 1. What rises from the mantle to create new oceanic crust?
  2. 2. What geological feature provides evidence for seafloor spreading?
  3. 4. What process is responsible for the creation of oceanic ridges?
  4. 6. Which element in magma contributes to the magnetization of oceanic rocks?