Cycle, Dem, Geo

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Across
  1. 3. Earth, landscape
  2. 8. Affecting many persons at the same time
  3. 11. To describe, explain, or illustrate by examples, specimens, experiments, or the like
  4. 13. A vehicle with two wheels tandem, handlebars for steering, a saddle seat, and pedals.
  5. 14. To process something in order to regain material for human use
  6. 15. The science that deals with the dynamics and physical history of the earth
Down
  1. 1. Of or relating to the internal heat of the earth
  2. 2. Relating to working with explosives
  3. 4. The surface traced by a straight line moving parallel to a fixed straight line and intersecting a fixed planar closed curve
  4. 5. The science dealing with the areal differentiation of the earth’s surface
  5. 6. A usually circular line encompassing an area
  6. 7. A system of government by the whole population
  7. 9. Of the people
  8. 10. The branch of mathematics that describes points, lines, angles, and figures in space.
  9. 12. Circle, wheel, round