Why Does an Airplane Shake (Turbulence) ? 
Airplanes fly through moving air currents in the atmosphere. Sometimes the air suddenlymoves upward, downward, or sideways. When an airplane enters this unstable airflow, the plane may shake slightly. This shaking is called Turbulence.
Causes of Turbulence: i. Rising warm air, ii. Sinking cold air, iii. Unstable or changing airflow, iv. Wind currents in the atmosphere
Turbulence is normal and usually not dangerous.
Fact: Airplane wings are designed to bend slightly and absorb turbulence, which helps keep the airplane safe and stable.
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