Across
- 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
- 7. a slight hill or hollow in the ground
- 9. the temprature and pressure is extreme in this layer
- 10. the direction of a magnetic or electric field
- 13. the force that attracts a body towards the centre of the earth
- 14. the upper layer of the earth's mantle below the lithosphere
- 15. the layer that we can see directly; the tinnest layer of the earth
- 16. the layer is a low viscosity fluid
- 20. a region around a moving electic charge within which the force of magnetism acts
Down
- 1. the gradual movement of the continents across the earth's surface through geological time
- 2. crust: the relatively thin part of the earth's crust which underlies the ocean basins
- 3. plates: the gradual movement of the continents across the earth's surface through geological time
- 4. the region surrounding the earth or another astronomical body in which its magnetic field is the predominant effective magnetic field
- 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
- 8. the tickest layer of the earth
- 11. the region of the earth's atmosphere above the stratosphere and below the thermosphere
- 12. the riged outer part of the earth, consisting of the crust and upper mantle
- 17. crust the relatively thick part of the earth's crust which forms the large land masses
- 18. pieces of earth's crust and uppermost mantle
- 19. the action or process of deforming or distorting