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Gravity, Inertia, and the Two Bulges. Two tidal bulges are created on opposite sides of the Earth due to the moon's gravitational force and inertias counterbalance. Click the image for a larger view.Gravity is a major force responsible for creating tides.Inertia, acts to counterbalance gravity. It is the tendency of moving objects to continue moving in a straight line. Together, gravity and inertia are responsible for the creation of two major tidal bulges on the Earth (Ross, D.A., 1995).ravity, Inertia, and the Two Bulges. Two tidal bulges are created on opposite sides of the Earth due to the moon's gravitational force and inertias counterbalance. Click the image for a larger view.
So there is a high tide bulge on two opposite sides of the earth at once, and of course then there are two low tide areas at roughly 90 degree angles to the high tides. A:Tidal forces are caused by the differential pull of gravity on a planetary body or moon. Consider the Earth-moon system.