EXTREME TERRAINS

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Across
  1. 2. A low area of land between hills or mountains, often with a river running through it.
  2. 3. A natural underground space, often created by erosion or geological activity.
  3. 6. A large, steep elevation of the earth’s surface, often with peaks.
  4. 7. Large, flat areas of land with few trees and often used for farming.
Down
  1. 1. A dry, barren area of land with little or no vegetation, usually with extreme temperatures.
  2. 4. A large area covered chiefly with trees and undergrowth.
  3. 5. Small raised areas of land, lower than mountains.