The correct option is (a).
Explanation
Air is a mixture of gases surrounding the Earth. The horizontal movement of air, driven by differences in atmospheric pressure, is defined as wind. Wind possesses kinetic energy, which varies based on its speed.
Statement-wise Analysis:
- Statement 1 is Correct: Moving air is scientifically termed wind. It flows from areas of high pressure to areas of low pressure.
- Statement 2 is Incorrect: While a gentle breeze is weak, wind can attain very high speeds (as seen in storms and cyclones). High-speed winds possess significant kinetic energy capable of uprooting trees, blowing off rooftops, and causing structural damage.
- Statement 3 is Incorrect: Windmills operate on the principle of converting the kinetic energy of moving air into mechanical or electrical energy. They require wind to rotate their blades; they cannot function in still air.
Key Takeaway:
Wind is moving air that possesses kinetic energy. This energy is utilized in technologies like windmills but can be destructive at high velocities.