Across
- 2. When two tectonic plates meet, one may slide underneath the other, curving down into the mantle
- 3. plates that move on the earth
- 9. see-sawing of air pressure over the S. Pacific, trade winds weaken & warm water sloshed back
- 11. the various mechanical and chemical processes that cause exposed rock to decompose
- 12. the two days per year on which the earth’s axis is not tilted toward the sun
- 15. organic, dark material remaining after decomposition by microorganisms
- 17. upper layer of mantle
- 18. two plates moving away from each other
- 19. rigid outer layer of the earth
- 20. perfect agricultural soil with optimal portions of sand, silt, clay
- 23. the process by which the surface of the earth is worn away by the action of water, glaciers, winds, waves, etc.
Down
- 1. the sun reaches the highest/lowest point creating the longest day (summer) and shortest day (winter) of the year
- 4. because of the rotation of the earth, winds and currents do not flow directly from areas of high pressure to areas of low, but instead they flow to the ‘right’ above the equator and to the ‘left’ below the equator
- 5. hard, most outer layer of earth
- 6. a mixture of organic and inorganic particles
- 7. found at plate boundaries
- 8. order of soil horizons
- 10. two plates coming together
- 11. an area or ridge of land that separates waters flowing to different rivers, basins, or seas
- 13. two plates sliding past one athoner, forms faults
- 14. zone of the earth’s interior between its core and its crust
- 16. Rock that has formed through the deposition and solidification of sediment
- 21. the hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago.
- 22. why the earth has seasons