Plate tectonics

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Across
  1. 1. A hot liquid that erupts from a volcano
  2. 4. a sudden violent shaking of the ground
  3. 7. A supercontinent that contained all of the Earth's continents
  4. 8. The very middle layer of the Earth
Down
  1. 2. A rock mound that erupts lava on the Earth's surface
  2. 3. A measurement of the size of an earthquake
  3. 5. Lava beneath the Earth's surface
  4. 6. The layer of the Earth between the core and the crust