Explanation:

The Earth's atmosphere, composed of various gases, is held in place around the planet primarily by the force of gravity. Gravity exerts a downward pull on all matter, including air molecules, preventing them from escaping into space. This gravitational pull creates atmospheric pressure and maintains the atmospheric layers. Option (1) Moisture is a component of the atmosphere but not the primary binding force. Option (2) Warm winds are air movements within the atmosphere, not the force holding it. Option (4) Earth's rotation influences atmospheric circulation (Coriolis effect) but does not hold the atmosphere to the planet.