Motion

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Across
  1. 3. Unit of speed
  2. 4. Calculated by distance/time
  3. 6. The slowest substance we observed
  4. 8. The speed of plate tectonics is very _______ motion
Down
  1. 1. The name of the point used to identify motion
  2. 2. The speed of light it very ______ motion
  3. 5. Unit of distance
  4. 6. Reference point for Earth's motion
  5. 7. Described by the changing of distance in relation to another object or place