6- vocabulary list - A

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Across
  1. 6. the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity
  2. 7. a slight hill or hollow in the ground
  3. 9. the temprature and pressure is extreme in this layer
  4. 10. the direction of a magnetic or electric field
  5. 13. the force that attracts a body towards the centre of the earth
  6. 14. the upper layer of the earth's mantle below the lithosphere
  7. 15. the layer that we can see directly; the tinnest layer of the earth
  8. 16. the layer is a low viscosity fluid
  9. 20. a region around a moving electic charge within which the force of magnetism acts
Down
  1. 1. the gradual movement of the continents across the earth's surface through geological time
  2. 2. crust: the relatively thin part of the earth's crust which underlies the ocean basins
  3. 3. plates: the gradual movement of the continents across the earth's surface through geological time
  4. 4. the region surrounding the earth or another astronomical body in which its magnetic field is the predominant effective magnetic field
  5. 5. a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associates with sea-floor spreading
  6. 8. the tickest layer of the earth
  7. 11. the region of the earth's atmosphere above the stratosphere and below the thermosphere
  8. 12. the riged outer part of the earth, consisting of the crust and upper mantle
  9. 17. crust the relatively thick part of the earth's crust which forms the large land masses
  10. 18. pieces of earth's crust and uppermost mantle
  11. 19. the action or process of deforming or distorting