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Birds glide effortlessly in the air with the help of
Birds glide effortlessly in the air with the help of
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Solution
The correct option is B Convection currents of air
When birds flap their wings the density of the air decreases nearby since the air particles move apart. This less dense air rises and helps the bird to keep flying. The denser air replaces this space. This movement is known as convection current of air.
When birds flap their wings the density of the air decreases nearby since the air particles move apart. This less dense air rises and helps the bird to keep flying. The denser air replaces this space. This movement is known as convection current of air.
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