"The influence of the earth " is a phenomenon consisting in

  1. Withstanding the significant shortening of the landing phase
  2. Reduction of induced drag and angle of attack required for level flight (at a given speed), which is due to the proximity of the groundCorrect answer
  3. Achieving greater power by internal combustion engines near the ground (for naturally aspirated engines)
  4. Achieving greater thrust to the ground - this effect disappears at a height approximately equal to the span of the aircraft

Explanation

Ground effect is the aerodynamic phenomenon experienced when flying close to the surface.

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