earth science

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Across
  1. 4. Sediments, matter, rainwater
  2. 6. formed at spreading centres on oceanic ridges
  3. 8. About 3.8 billion years ago
  4. 12. 71% of Earth’s surface
  5. 13. rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium
  6. 14. Evolution of species
Down
  1. 1. the layer of granitic, sedimentary, and metamorphic rocks
  2. 2. openings where magma shoots out of earth
  3. 3. 97% saltwater, 2% glaciers and ice sheets, 1% freshwater
  4. 5. when two plates slip past each other
  5. 7. rock which is rich in magnesium and iron.
  6. 9. Able to evaporate
  7. 10. Asteroids, volcanoes, etc.
  8. 11. Salt in ocean over time