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The lower atmosphere and hydrosphere are bound to the earth by gravity.
Gravity is a fundamental interaction that causes all things with mass or energy to be attracted (or gravitate) toward one another.
Gravity is by far the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction.
However, gravity is the most significant interaction between objects at the macroscopic scale, and it determines the motion of planets, stars, galaxies, and even light.
Learn more about Gravity, refer to:
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