First Humans

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Across
  1. 2. the Ring of Fire is in this ocean
  2. 4. Neanderthals primarily inhabited this continent
  3. 5. rupture in Earth's crust allowing hot lava, ash, and gases to escape
  4. 8. first continent inhabited by humans
  5. 9. ocean between Europe & Africa on the east and The Americas on the west
  6. 12. layout of an archaeological excavation site marked with intersecting lines
  7. 13. number of continents on Earth
  8. 15. extinct ancient species of human
  9. 17. ancient species of human that evolved into sapiens
  10. 18. smallest, shallowest, and coldest ocean on Earth
  11. 20. sudden shaking of the ground caused by seismic waves in Earth's surface
Down
  1. 1. layer of rock between the crust and core making up 84% of the Earth's volume
  2. 3. land bridge first crossed by humans to get from Siberia to North America
  3. 6. first continent inhabited by humans after leaving Africa
  4. 7. only surviving species of humans
  5. 10. Australia sits on this tectonic plate
  6. 11. last present-day country inhabited by early humans
  7. 14. thick outer shell of rock less than 1% of Earth's volume
  8. 16. present-day state USA first inhabited by sapiens
  9. 19. very hot and dense center of Earth with solid and liquid parts