Earth Science Unit Vocabulary

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Across
  1. 4. tide occurs twice a month when the sun and moon are at a right angle to the earth
  2. 5. and fall both have equal daytime and night time
  3. 6. eclipse moon’s shadow
  4. 7. when one object in space blocks another from view; a shadow
  5. 9. has longer days and shorter nights
  6. 11. currents transfers heat from one place to another
  7. 12. floor spreading the process by which molten material adds new oceanic crust to the ocean floor
  8. 13. boundary where two plates move past each other in opposite directions
  9. 15. the rise and fall of sea levels
  10. 17. the process by which oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary
  11. 19. tectonics the theory that pieces of earth’s lithosphere are in constant motion driven by convection currents in the mantle
Down
  1. 1. boundary where two plates move away from each other
  2. 2. a theory that suggests all the continents were once connected
  3. 3. has shorter days and longer nights
  4. 8. boundary where two plates move towards each other
  5. 9. caused by the tilt of earth’s axis
  6. 10. ocean ridge an undersea mountain chain where new ocean floor is produced
  7. 14. tide caused by the alignment of the sun and moon with the earth
  8. 16. eclipse earth’s shadow
  9. 18. ocean trench a deep valley along the ocean floor