Atmospheric air is held to the Earth by the force of gravity. Just as gravity keeps our feet on the ground and prevents the oceans from floating away, it also pulls on every molecule of gas in the air. This invisible pull keeps our atmosphere wrapped tightly around the planet instead of drifting off into the vacuum of space. ANSWER: (A) Gravity
Atmospheric air is held to the Earth by – (A) Gravity (B) Clouds (C) Precipitation (D) Earth’s rotation
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Gravity is the anchor of our atmosphere. Every gas molecule, from oxygen to nitrogen, has a tiny amount of mass. Earth’s massive size creates a strong gravitational field that pulls these molecules toward the center of the planet. This pull is strongest at the surface, which is why the air is “thicker” or more dense at sea level than it is on top of a mountain. Without gravity, the kinetic energy of the gas molecules would cause them to fly away into space, leaving Earth as a lifeless, airless rock like the Moon.
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