Plate tectonics

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Across
  1. 4. drift the idea that long ago one very large landmass was split into the continents we have today
  2. 6. a set of ideas that explains observations and is supported by evidence
  3. 7. current movement of material like rock inside Earth caused by differences in density. This movement can go up and down or in circles and helps move tectonic plates
Down
  1. 1. the process where one tectonic plates moves under another plate and slides down into the Earth because of plate movements
  2. 2. reversal when Earth's magnetic north and south poles swap places
  3. 3. tectonics Earth's outer layer is made of big moving pieces
  4. 5. spreading the process where new ocean floor forms as hot rock rises at places called mid-ocean ridges. The hot rock (magma)cools and becomes solid rock and the older ocean floor moves away from the ridge