Lesson 6

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Across
  1. 3. Glacier, a massive, continuous body of glacial ice that covers a vast area of land, such as a continent or a large part of one.
  2. 4. a geological epoch that lasted from approximately 2.6 million years ago to about 11,700 years ago, marked by cycles of glacial advance and retreat
  3. 6. the study of human societies and cultures and their development.
  4. 9. Region, relating to or occurring between different regions.
  5. 10. the rigid outer part of the earth, consisting of the crust and upper mantle.
  6. 11. the study of human history and prehistory through the excavation of sites and the analysis of artifacts and other physical remains.
  7. 13. relating to or occurring between different regions.
  8. 15. Points, each of the four main points of the compass (north, south, east, and west).
  9. 17. a half of the earth, usually as divided into northern and southern halves by the equator, or into western and eastern halves by an imaginary line passing through the poles.
  10. 18. a supercontinent that existed from the late Paleozoic to early Mesozoic eras, about 335 to 175 million years ago, when all of Earth's landmasses were joined into a single landmass.
  11. 20. a graphic representation of the passage of time as a line.
  12. 21. an expert in or student of history, especially that of a particular period, geographical region, or social phenomenon.
  13. 24. Slipping, the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
  14. 25. the period of time before written records.
  15. 26. an object made or modified by a human being, typically one of cultural or historical interest.
Down
  1. 1. Shelf, the submerged, relatively shallow, and gently sloping edge of a continent that extends from the coastline to the shelf break.
  2. 2. Age, a glacial episode during a past geological period.
  3. 5. a slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles.
  4. 7. Period, a relatively warm phase between two glacial periods (ice ages), characterized by global warming and a retreat of ice sheets.
  5. 8. a large, distinguishable part of a continent, such as North America or southern Africa.
  6. 12. a mass of rocks and sediment carried down and deposited by a glacier, typically as ridges at its edges or extremity.
  7. 14. Period, a long, cold interval of time within an ice age when glaciers and ice sheets expand to cover large areas of the Earth's surface.
  8. 16. relating to or occurring between different regions.
  9. 19. the study of the physical features of the earth and its atmosphere, and of human activity as it affects and is affected by these, including the distribution of populations and resources, land use, and industries.
  10. 22. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
  11. 23. tectonic, the scientific theory that Earth's outer layer (lithosphere) is divided into large and small plates that move relative to one another, floating on the hotter, more mobile asthenosphere beneath