Whale Sharks use Geometry to Avoid Sinking

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Across
  1. 2. go up or climb
  2. 3. the branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogues
  3. 6. move or fall downwards
  4. 7. parallel to the plane of the horizon; at right angles to the vertical
  5. 8. the strength and vitality required for sustained physical or mental activity
  6. 9. an instrument for measuring the acceleration of a moving or vibrating body
Down
  1. 1. at right angles to a horizontal plane; in a direction, or having an alignment, such that the top is directly above the bottom
  2. 4. the ability or tendency of something to float in water or other fluid
  3. 5. move with a smooth, quiet continuous motion