BRAVE PEOPLE IN HISTORY

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Across
  1. 4. Someone who climbs mountains for sport
  2. 5. a person who has been trained for travelling in space
  3. 6. the round object that moves in the sky around the earth and can be seen at night:
Down
  1. 1. The measured amount of heat in a place or in the body
  2. 2. A raised part of the earth's surface
  3. 3. a person who flies an aircraft: